新手机连一个8M都为什么恢复出厂设置下载不了东西,恢复出场设置也不行,但设置里显示有大量空间??怎么办

新入手的T805c
32G 下了几个常用的软件 手机存储和SD存储都还有31G的空间 用下载的视频软件(如乐视,腾讯视频,搜狐视频等等)缓存视频 却足够空间 无论路径选择手机还是存储卡都是 求帮助!
按时间排序
不能,好好查看下,到底还有多少存储容量吧。如果是32G的平板电脑,那么实际上,去掉操作系统,大概只有29个G左右的可用空间了。所以没有那么大。这些视频软件是支持自定义播放路径的,所以可以在设置里面,将他们的缓存空间设置成内部存储的路径,就可以下载缓存中了。
你的表达让人头大,建议你还是找人实际帮你看一下吧!有些东西,有人实际操作给你看好过这里的文字许多倍!要是我等的表达和你一致的话,估计你也只有头大而已!-----新年快乐吧。。。
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请输入私信内容:D盘有2.58个G 但是里面只有kszzlog这个文件夹占了27、8M 隐藏文件也没占什么空间 为什么只有600来M了 不解_百度知道
D盘有2.58个G 但是里面只有kszzlog这个文件夹占了27、8M 隐藏文件也没占什么空间 为什么只有600来M了 不解
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如果没有重要的东西,建议你格式化。我有个优盘也这样,以前存过许多东西,后来乱码了,把文件都删了但仍然占以前的内存。
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一间教室长8m,宽6m,5m.六一班有48名学生坐在这间教室里面上课,平均每人占有的空间有多少
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: 当前目录建立config.asy,内容为 gsOptions=&-P&;
: http:/ /sourceforge.net/projects/asymptote/forums/forum/409349/topic/3915524
: MATPLOTLIB中类似matlab中axis equal和axis tight的命令是xax=plt.gca()xax.set_aspect(1,adjustable='box')plt.axis([0.8 ,1.5 ,-0.4 ,1])
: xax.autoscale_view(tight=True)
: texmakerx现在为texstudio,ubuntu下需要编译安装,natty narwhal 下编译后信息为:Using Qt Version 4.7.2, compiled with Qt 4.7.2
: texmaker依旧不好用。
: tex中, 首页与其他页布局不同(如顶端不对齐)的原因是:首页中的\centering \fontsize将影响下一页,而首页前是按照缺省的\fontsize,所以首页开头也要设置\fontsize等参数。
: ubuntu disk space: info coreutils 'df invocation'
: df: 对于根目录/ (Size-Used-Available)/Size*100%=5%(用tune2fs -m可调) free=Size-Used, Available=Size-Used-Size*5% 对于其他挂载的系统 Size-Used-Available=0,free=Size-Used, free=available, Available=Size-
: 对于其他挂载的系统 Size-Used-Available=0,free=Size-Used, free=available, Available=Size-Used-Size*0%
: df -i 用来检查有空间无i node的情况。
: convert -chop 120x100 -rotate 180 -chop 110x90 -rotate 180 -resize 500x375 *.png a3.gif
: 重复:相位是频率对时间的积分而不是乘积。如exp(j*beta*t*t).
: Linux CLI, stat - display file or file system status, stat -c %Y f1.txt, date +&%s& -r f1.txt .对于date, %s 指seconds since
00:00:00 UTC。
: Digital Transmission Engineering 定价 :¥1,452.00 会员价 : ¥1,452.00 校园优惠价 :¥折) 作者: John B. Anderson 出版社:Wiley, John & Sons, Incorporated ISBN:1
: Synchronization of Digital Telecommunications Networks
: Digital Clocks for Synchronization and Communications
: Digital Communication Receivers: Synchronization, Channel Estimation, and Signal Processing (Volume 2): Heinrich Meyr, Marc Moeneclaey, Stefan A. Fechtel Wiley-Interscience |
: Synchronization in Wireless Sensor Networks: Parameter Estimation, Peformance Benchmarks, and Protocols
: David J. Kinniment &Synchronization and Arbitration in Digital Systems&
: sed -n '/href/{N;/\n.*汉字/p}' file 不起作用。sed -n '/href/{N;/\n.*englishword/p}' file 起作用。
: line1 href line2 href line3 汉字 line4, 跟汉字无关,汉字出现在偶数个href的后面。
: sed -n '/汉字/{x;G;p};h' file#类似grep -B1 汉字
: arecord, aplay - command-line sound recorder and player for ALSA sound‐card driver
: help.ubuntu.com/community/SoundTroubleshooting
: help.ubuntu.com/community/alsa-oss
: Otherwise, numbers take the form [base#]n, where the optional base is a decimal number between 2 and 64 representing the arithmetic base, and n is a number in that base.
: bash manual
: Strip the leading zeros of number. v=000110;echo $((10#$v))
: let w=”10#$v”
: If the extglob shell option is enabled using the shopt builtin, several extended pattern matching operators are recognized. In the following description, a pattern-list is a list of one
: *(pattern-list) Matches zero or more occurrences of the given patterns
: Strip the leading zeros of number. v=000110;echo ${v##*(0)}
: bash,删除数字前面的0,b=$(echo 0000100 | sed 's/^0*//');echo $b,这样0000000将为空(应该为0),修改为b=$(echo 0000100 | sed 's/^0\{,4\}//');echo $b
: bash, ls -l | wc -l 实现当前文件夹下文件个数的计算(多一个,包括第一行total)。ls -1 | wc -l 不会多一个。
: iconv实现GB18030到UTF-8的转换。
: MldonkeyFox protocols Handler 0.13 不能解析 文件名中有斜杠字符的链接。
: 用sed把ed2k链接中的名字改一下就可以,ed2k是通过hash区分文件的而不是名字。
: Add line number to text , nl filename, cat -n filename , sed = filename | sed '{N;s/\n/./}' .
: sed 中找到最后一个匹配: sed '$s/\(.*\)XX.*/\1/',主要用到parentheses。
: sed 的RE 是 Greedy Match,不能实现在perl里可以实现的&.*?XX&这种NonGreedy Match。解决的办法是找到第一XX替换成\n,然后删掉这一行。
: 用highlight命令将bash脚本转换为高亮显示的bbcode代码。highlight -Y -i **.sh, -Y为bbcode输出。
: gvim 可以把source file convert to HTML。
: # delete all trailing blank lines at end of file sed -e :a -e '/^\n*$/{$d;N;ba' -e '}' # works on all seds
: 对于用amule下载的文件都有一个hash值或称为文件指纹,ed2k的hash基于md4算法(wiki.amule.org/index.php/MD4_hash),验证下载的文件是否正确不能用md4校验程序(ubuntu里有md5sum,sha1sum,有openssl dgst -md4)。验证方法
: 验证方法是将文件放在amule的共享目录内,从amule界面查看共享文件时将会显示FILEID,既Hash值,可与原始文件的Hash(含在ed2k的链接里)比较。
: 用CLI的mplayer时,用xdotool模拟键盘输入很有用,实现自动重复。如xdotool key Left模拟左箭头,即seek backward 10 seconds。
: www.linuxquestions.org/questions/linux-desktop-74/bash-script-to-simulate-keyboard-entry-862060/
: man命令的使用类似vi,如查找,/pattern,用n前向查找下一个,N反向查找下一个。
: ubuntu里的中文文件名的编码为UTF-8,也可以为GB18030但显示为乱码,不过如果放在ftp目录下,用firefox通过ftp看GB18030编码的文件名则会正确显示。但ipad2里的safari看的ftp里的中文都是问号。
: 对于文本:Head
。执行sed 's/^.*123//' xxx。将得到 789。类似bash中的${parameter##*123}而不是${parameter#*123},即去掉最长匹配。
: sed 好像不能处理GB18030编码的文本,但可以处理UTF-8的文本。对于GB18030编码的文本只需用gedit另存选utf-8编码就可。
: 也不能说是sed不能处理,应该是term不支持显示GB18030编码的中文。
: ** (gedit:5488): CRITICAL **: _gedit_tab_save_as: assertion `encoding != NULL' failed保存时手动选编码如UTF-8
: url , percent encode decode,fnamepercent=&%E8%BF%9E%E7%8E%AF%E7%94%BB& fnamecn=$(python -c & print urllib.unquote(\&$fnamepercent\&)&)
: wget $furl --output-document=$fnamecn
: ubuntu natty下realplayer10无声。安装alsa-oss,执行aoss realplay解决。
: vim. 将xxx替换成换行符 :%s/xxx/^M/g,^M为CTRL-V CTRL-M。详见:h sub-replace-sepcial。
: vim, how to comment multiple lines. (Enter command mode in VIM):2,5s/^/#/g , 在2到5行的开头插入注释符号#。 reference: www.pinoytux.com/linux/vim-trick-how-to-comment-multiple-lines
: uncomment用 :2,5s:^# 或 :2,5s:^#*
: 设置chrome的proxy后,会产生环境变量如http_proxy,https_proxy等,这将影响wget的使用。
: IPAD中用safari下载vsftpd中的rmvb文件,提示“下载失败 Safari无法下载此文件”,将rmvb更改为rm解决。原因是没有与rmvb关联的应用程序。即使安装了Oplayer等能够识别rm文件的应用程序。
: 720X395分辨率视频声音同步没问题,虽然没有电脑流畅。
: Merriam-Webster's.Advanced.Learner's.English.Dictionary.prc可以用Mobipocket reader打开。
: amule中有一项“last seen complete&的意思是shows the last time you've seen the entire file provided by the sources you've asked。
: ubuntu11.04 用Arista Transcoder 0.9.6转换视频格式以适于ipad播放,提示不能找到GStreamer element x264enc,安转gstreamer0.10-plugins-ugly-multiverse解决,
: 00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02)01:00.0 VGA compatible controller: ATI Technologies Inc NI Seymour [AMD Radeon
HD 6470M] (re
: lspci | grep -i vga
: lspci -v -s 00:02.0
: www.cyberciti.biz/faq/howto-find-linux-vga-video-card-ram/
: baidu的逻辑搜索的非 “-” 不起作用。
: wiley Ubuntu(R) Linux(R) Toolbox:1000+ Commands for Ubuntu and Debian Power Users 2008
: motion, www.lavrsen.dk/foswiki/bin/view/Motion/WebHome
: 如果只是用CL收发邮件,如用MUTT,则选MTA时用postfix显得过于复杂,用msmtp就可以。
: msmtp --host=smtp.126.com --serverinfoSMTP server at smtp.126.com (m50-112.126.com [123.125.50.112]), port 25: 126.com Anti-spam GT for Coremail System (126com[])Capabilities:
: AUTH: Supported authentication methods: PLAIN LOGIN
: telnet smtp.126.com 25
: sudo dpkg-reconfigure postfix
: ubuntu下禁用touchpad, Run gconf-editor Edit the keys in the /desktop/gnome/peripherals/touchpad/ folder.//wiki.archlinux.org/index.php/Touchpad_Synaptics#Synaptics_Special_Ability
: Gnome, Ctrl+Alt+Tab Give focus to a panel.//library.gnome.org/users/gnome-access-guide/stable/keynav-5.html.en
: 用fbreader打开epub文件。
: 关闭firefox的plugin-container。用top命令查看,plugin-container占用大量cup资源,副作用远大于作用。关闭方法:about:config, dom.ipc.plugins.enabled 设为false。
: William von HagenUbuntu(R) Linux(R) BibleThird EditionFeaturing Ubuntu 10.04 LTS. 简评:桌面内容(图形界面)的操作占主要部分,CL的内容基本没有。
: Gnutella
: The Macmillan Visual Dictionary
: 用GIMP制作1bit单色图形文件。首先color-&threshold,然后Image-&mode-&indexed,弹出Indexed Color Conversion对话框,选1-bit palette。
: Image Properties对话框里:Color space: Indexed color(2 colors),一般是RGB或Grayscale
: 5100 × 6600 pixels的图像,bmp灰度占32M,1bit占4M。若为png格式灰度占58k,1bit占18k。
: linux下的图形图像手工绘制处理软件,LibreOffice Draw,GIMP,Inkscape,Dia
: 为什么有些国产软件不够厚道。那时推出easymule时用了一次就删除了,还是用www.emule-project.net上的emule,刚才看到//emulefans.com/easymule2-alleged-plagiarism-from-amule/ 。
: shell里打开GB18030编码的文本文件显示为乱码。待解决。
: ~$ localeLANG=en_US.UTF-8LANGUAGE=en_US:enLC_CTYPE=&en_US.UTF-8&LC_NUMERIC=&en_US.UTF-8&LC_TIME=&en_US.UTF-8&LC_COLLATE=&en_US.UTF-8&LC_MONETARY=&en
: ubuntu用gedit打开中文文本文档出现乱码。解决方法:gconf-editor程序-&apps-&gedit-2-&preferences-&encodings中auto_detected添加GB18030并置顶。
: www.thegeekstuff.com/-examples-to-master-linux-command-line-history/ —— www.thegeekstuff.com/-practical-linux-find-command-examples/
: ubuntu11.04使用evince打开ps文件,然后打印到文件选择pdf格式,提示Failed to print document和Printing is not supported on this printer。替换办法:用ghostscript包里的ps2pdf程序。
: matlab2011a/bin/util/oscheck.sh: 605: /lib/libc.so.6: not found _________________ libc6 Embedded GNU C Library: Shared libraries
: ngspice进行ac分析,结果通带是负值,阻带接近0,原因在于语句“V1 0 3 AC 1 180”中的1的正负,180度还是0度初相,0 3还是3 0,这三个地方都可改变极性。
: ngspice&source xx.net ngspice&run ngspice&plot
: 最近ZF对网站的fengsuo更严厉了,这种政策将会阻碍发展。
: 找资料过程中用baidu搜中文网站的内容看是否有该资料,有一个方便下载该资料的网站居然没有列出,而google(偏好设置为中文)搜时该网站排在首页,顺利下载。以后中文网站也用google搜。
: only the server versions of Mac OS X are designed to be used in a as a result, VirtualBox does not support client versions of Mac OS X as a guest.
: www.virtualbox.org/manual/ch03.html
: VB4上安装Snow Leopard 10.6.7提示&still waiting for root device&,待解决。
: ubuntu下安装AcetoneISO用于将dmg文件转换成iso文件,但该功能在从ubuntu repositories 里安装AcetoneISO后需单独下载。
: Virtual Box 4.0安装Snow Leopard,可以读取dmg镜像,运行时提示:VT-x/AMD-V hardware acceleration has been enabled, but is not operational. Certain guests (e.g. OS/2 and QNX) require this feature.Please
: Please ensure that you have enabled VT-x/AMD-V properly in the BIOS of your host computer.
: i3 390的cpu支持VT-x,natty narwhal系统或bios可能不支持,先在设置里关掉,待解决。。
: 该问题可通过在bios里enable Virtulization项解决。
: CompTIA :Computing Technology Industry Association . CompTIA Linux+(TM)
: Britannica Illustrated Science Library (16 Vol Set)Britannica Discovery Library (12-volume set)
: ubuntu: cksfv校验sfv文件的工具。\nxiaj@xjUbuntu:~/Downloads$ cksfv hxxxxxx.r03
: ; Generated by cksfv v1.3.14 on
at 21:13.36
: hxxxxxx.r03 7C4FAC84
: cksfv is a tool for verifying CRC32 checksums of files.
: Simple file verification (SFV) is a file format for storing CRC32 checksums of files to verify the integrity of files.————en.wikipedia.org
: 在ubuntu 11.04+firefox 4下 点击ed2k链接提示无应用程序关联。采取:about:config设置。wiki.amule.org/index.php/Ed2k_links_handling#Firefox_2_and_3_.28or_later.29 但无效。
: 即network.protocol-handler.external.ed2k true
: 和 network.protocol-handler.app.ed2k string /usr/bin/ed2k 或 ed2k
: network.protocol-handler.expose.ed2k false
: 按照wiki.amule.org的指示设置上面3个参数设置后,再安amule-gnome-support,但最终无效。
: 解决办法:安装firefox add-ons MldonkeyFox protocols Handler 0.13 by Wile
: gedit,可以使用\n表示换行符,用\\n表示\n。这样在替换时很有用。
: 为什么这么说呢?难道你碰到相关的问题了?分享出来嘛,以便大家都能学习学习,共同进步。呵呵
: 好,举个例子,比如希望遇到 &&&字符换行,但原来的文件一行包含多个&&“,这样就可以用”\n&“替换”&“
: RAR 4.00 beta 3 Copyright (c)
Alexander Roshal 17 Dec 2010Shareware version Type RAR -? for helpExtracting from /home/xiajing/t/t.rarNo files to extract文件名称为中文时有该问
: 压缩文件名为中文导致File Roller 2.32.1的报错信息。
: 命令行下的rar:AUTHOR This manual page was written by Petr Cech &cech@debian.org& according to &rar -h& for the Debian GNU/Linux system (but may be used by oth‐
: 还有命令行下的unrar。AUTHOR This manual page was written by Petr Cech &cech@debian.org& according to &rar -h& for the Debian GNU/Linux system (but may be used by oth
: 压缩文件名为中文用 unrar e xxx.rar可以正确解压,看来问题在file roller上。
: file roller用rar,所以卸载rar,重装unrar可以解决解压问题。
: UNRAR 4.00 beta 3 freeware Copyright (c)
Alexander Roshal
: RAR 4.00 beta 3 Copyright (c)
Alexander Roshal 17 Dec 2010 Shareware version Type RAR -? for help
: 该文件用rar解压中文为乱码,用unrar解压正常。
: ubuntu的ftp client , FileZilla ,包含file name filter,很方便,查阅服务器文件时可以滤出希望的内容,但没有像flashfxp那样高亮显示包含特定字符串的文件的功能。
: 试了下笔记本上ubuntu的双显示器,用VGA线接上电视,在system-preferences-monitors里可以detect显示器,并可以设置。然后通过键盘的功能键两个显示器可以设置成显示相同内容,相同的第二个屏幕内容,两个屏幕内容并列显示,这样
: 这样就可在一个屏幕查资料,在另一个屏幕写记录。
: 有些网站做事不光明,比如注册的wy信箱,收到wy微博信件说有两条新评论,但打开一看,根本没有,而且关注的人有30个,之前并没有手动设置关注一个人。
: 类似的网站还有rr,信箱里经常收到来自rr的好友请求。其实 是网站假冒用户的名义发的。
: 昨天看了开心起诉qianxiang的案子,说qianxiang的(jia)开心推广中侵犯隐私,发垃圾邮件。rr也是qianxiang的。qianxiang的做法很不对。
: ubuntu tool, top , powertop
: ubuntu的system V和 upstart。help.ubuntu.com/community/UbuntuBootupHowto
: o Meeting entries remind you of events that have a specific date and time.o Meeting requests are invitations that you can send to the participants. Before youcan create meeting requests
you must h
: Before you can create meeting requests you must have a compatible mailbox configured to your device. o Memo entries are related to the whole day but not to a specific time of the day. o Anniversary
: Anniversary entries remind you of birthdays and special dates. They refer to a certain day but not a specific time of the day. Anniversary entries are repeated every year.
: To-do entries remind you of a task that has a due date but not a specific time of the day.
: 所以,用会议可以更精确。
: tor, Jul 02 08:47:25.464 [Warning] Problem bootstrapping. Stuck at 10%: Finishing handshake with directory server. (DONE; DONE; count 3; recommendation warn)
: ubuntu11.04的firefox4.0不能打开webster的声音。
: Bounced Check。跳票。www.investorwords.com/561/bounced_check.html
: Natty Narwhal
: 问题:Blender, u3d?
: GNOME Sensors Applet
: drwxr-xr-x 5 xiajing xiajing -06-27 13:27 da-rwxrwxrwx. 1 root root 9-04-22 03:02 ini drwxr-xr-x 3 root root -18 16:32 m -rwxrwxrwx. 1 x
: 注意x后1前的“点”:-rwxrwxrwx. 1
: psensor的bug,当关掉独显时,其sensor的值无效且极大,勾选绘制,psensor仍然处理该无效的大数,导致处理时间过长,界面僵住。打开独显,界面正常。
: 备份我的迷你博客:#!/bin/bashfor i in {1..19};dowget -P OK & hi.csdn.net/space-1862655-do-doing-view-me-page-$i.html&done
: http askubuntu.com/questions/39562/radeon-module-boot-problems
: thanks marto: add blacklist radeon to the end of /etc/modprobe.d/blacklist.conf
: add these lines before 'exit 0' in /etc/rc.local &modprobe radeon echo OFF & /sys/kernel/debug/vgaswitcheroo/switch&
: Ubuntu11.04, HP notebook, AMD Radeon HD 6470M.独显驱动导致黑屏的解决。
: ubuntu11.04, more /etc/default/console-setup 和 /etc/default/keyboard 配置缺省键盘和console
: Ubuntu dmesg[ 156.499343] radeon: switched off[ 156.565554] radeon .0: power state changed by ACPI to D3
: uk.computers.toshiba-europe.com/innovation/download_whitepaper.jsp?service=UK&WHITEPAPER_ID=
: 01/07/98 ACPI Specification
: D3 - Off , D0 – Fully On
: Ubuntu下双显卡的设置,help.ubuntu.com/community/HybridGraphics
: HP双显卡的机器进入Ubuntu有时候卡住,比如由市电转为电池供电时,这时需要先进Win7,重启,然后才能进入Ubuntu。
: 问题在sudo bash -c &echo OFF & /sys/kernel/debug/vgaswitcheroo/switch&,和 restart上 ,shutdonw后再重启问题解决。
: 表面现象,没有探求内部原因。待软件升级自动解决。
: 该问题的出现和解决是随机的,时好时坏,主要原因是,显卡驱动,先不载入显卡驱动,然后载入再关掉。
: 见06-27 00:06的解决。
: 问题:HP 笔记本 的触摸板 在UBUNTU无双击锁定功能 ,找其特定驱动
: Ubuntu 11.04 停用独立显卡,sudo bash -c &echo OFF & /sys/kernel/debug/vgaswitcheroo/switch&, 如果sudo echo OFF & /sys/kernel/debug/vgaswitcheroo/switch则permision denied
: http://ubuntuforums.org/showthread.php?t=1495123&page=8
: sudo cat /sys/kernel/debug/vgaswitcheroo/switch
: 该语句在/etc/rc.local中加载后 黑屏。
: 启用独显,sudo bash -c &echo DDIS & /sys/kernel/debug/vgaswitcheroo/switch&
: 关掉独显功率为17W左右,打开独显功率为28W左右,独显消耗大量能量。
: 在Ubuntu下用Indicator Applet Complete 查看。
: cat /proc/acpi/battery/BAT0/info
: info bash,then press s to search shell command.
: Ubuntu11.04的Unity不是很习惯,不如traditional env,不过似乎对显卡有要求,升级了显卡驱动提示:It seems that you do not have the hardware required to run Unity.
: HP笔记本预装的Win7把四个主分区都用了,虽可shrink腾空间,但无法创建扩展分区,Ubuntu11.04的安装CD的分区工具虽可调整C盘大小,但add按钮是灰色的。
: 解决办法1:用partimage工具备份一个主分区(recovery),删该主分区,创建同样大小的逻辑分区恢复。
: 该方法要动recovery分区,一个备份分区,不是很好.
: 解决办法2:用Partition Wizard工具将C盘变为扩张分区中的逻辑盘
: PW是free software, C盘也是可以变动的,很好。
: 扩展分区
: OO Writer里显示空格 tools-&options-& OO.org Writer-&Formatting Aids
: Online office suite
: Think free 对中文的支持很有限,很多中文字都是方块。
: Zoho感觉还不错,有中文支持,不过对safari的支持还有待加强。
: Adobe Buzzword 不支持中文输入。
: 设置imap后,通过&同步&-&“文件夹订阅”可以同步“草稿箱”里的内容,但不能修改。
: Nokia的手机,电邮服务-&新信箱-&开始,出现了预设的邮箱供应商帐号,自己的邮箱不再此列,选其他,输入帐号,密码,显示正在验证电子邮件,然后跳出。解决办法,输入错误的帐号和密码。如1@1 1
: ipad上的手写软件:UYH,UPAD Lite,neu.Notes。
: Remote desktop 软件:2X Client
: 新闻软件:CNN,AP News,NPR
: 数学软件:PocketCAS
: 办公软件:free spreadsheet 支持CSV和共享
: PDF阅读软件:stanza,iBooks
: 字典:merriam Webster
: 试试safari,不支持的地方不少,另外ipad2还是比较沉的。
: 这几天楼层电气间多了个配电箱,内有HEADWAY GYXTW光缆。
: word 2003在自动编号后插入表格可以实现表格的各格自动编号(横向), 也可实现第一例按行编号,其他列不能有编号,不然编号先横向递增。
: 用xp的“文字服务和输入语言”安装日语 Microsoft IME Standard 2002 ver. 8.1 和Microsoft Natural Input 2002 ver. 8.1就可以用IME pad手写输入识别日文。
: 衬衫上的标识, 棉 50% ポリエステル 50%, 后者手写识别翻译为Polyester。
: DIY Layout Creator,diylc-3.0.8-beta
: perfboard( perforated board), Stripboard
: www.printedcircuitsboards.com/software/88/veroboard-stripboard-software.html
: ppt到word的转换,ppt-&pdf-&word
: www.pdftoword.com
: kicad tutorial
: RF Components and Circuits Publisher: Newnes | ISBN:
: The Circuit Designer’s Companion Second edition Tim Williams Newnes 2005
: Programmable Oscillator Uses Digital Potentiometers
: Sine Wave Generation Techniques National Semiconductor Application Note 263 March 1981
: paramagnetic, diamagnetic, nonmagnetic materials
: ferromagnetic
: www.ndt-ed.org/EducationResources/CommunityCollege/MagParticle/Physics/MagneticMatls.htm
: SAW resonators
: LTsice IV SPICE directive: K1 L1 L2 L3 1.www.simonbramble.co.uk/lt_spice/ltspice_lt_spice_tutorial_3.htm
: 《双色图文详解电容器及应用电路》胡斌 人民邮电出版社
: Electronics Sensors for the Evil Genius: 54 Electrifying Projects
: Fun Projects for the Experimenter - N. Braga with METAL DETECTOR
: Radio Society of Great Britain_Microwave Know How for the Radio Amateur_Andy Barter_2010, 振荡器论文www.vhfcomm.co.uk/i-oscillators.html,方向:DDS,MMIC
: Artech House_Foundations of Oscillator Circuit Design_Guillermo Gonzalez 2007
: geda:* 1 INVERTINGINPUT* 2 NON-INVERTING* 3 OUTPUT* 4 POSITIVEPOWERSUPPLY* 5 NEGATIVEPOWER.SUBCKT LM124 1 3 2 4 5 建立sym时的pinseq属性的顺序从1到5要对应上面的13245。
: 保证netlist中的“XU1 inv out non pos 0 LM124“语句中的顺序与subckt中一致。
: geda:SPICE model (LMXXX.mod),SPICE include(xjsim.cmd),gnetlist -g spice-sdb -o xj.net xj.schngspice -b xj.net -r result.raw -o message.loggwave result.raw
: bash. $history
: Newnes_Oscilloscopes How to use them how they work_5th ed_Ian Hickman 2000
: 电容小,响应快,但电抗也大,用作耦合电容时分压也大。增加负载阻抗虽然可以增加负载电压,但放电时间延长,如果有开关电路,会形成严重拖尾。所以电容值和负载阻抗值的选取很重要。
: 电容小,电抗大,增加频率减小电抗。
: Electronic Test Instruments: Analog and Digital Measurements (2nd Edition) Practical Radio Frequency Test and Measurement: A Technician's Handbook
: Analog and Digital Filter Design Using C (Bk/Disk), 1/e Leslie D. Thede
: Synthetic Instruments Concepts and Applications by C.T. Nadovich 2005
: Electronic Instrument Handbook Clyde F. Coombs 1999
: The Book of Postfix: State-of-the-Art Message Transport Linux Email By Alistair McDonald, Ian Haycox, Magnus B?ck Postfix: The Definitive Guide
: Linux Command Line and Shell Scripting Bible [Paperback]Richard Blum 2008
: R2011a Documentation → MATLAB,[SN,CN,DN] = ellipj(U,M), U is limited to real values.
: 问题:u为复数,sn(u+jX,M)的计算。
: mutt +msmtp , ~/.muttrc set from= set realname set sendmail=&msmtp& ~/.msmtprc account defaulthost smtp.xx.cnauth loginfrom user xjpassword xx
: 发附件:mutt -s &Test mail&
-a attachedfile & mailtext
: 可以将资料都传到邮箱。
: email control
: Postfix instead of msmtp
: 刚开始一直都发不了邮件,包括msmtp得不到serverinfo,花了不少时间找原因,原来两年前把25端口就封了。
: How do I configure Mutt to use a remote SMTP server to send mail?Mutt can't do so directly (read the MailConcept to understand why this won't change). You must specify a local MTA to
: wiki.mutt.org/?MuttFaq/Sendmail
: Update: Recent versions (1.5.x) of Mutt has built-in SMTP support.
: ubuntu中设置硬件时间是否为本地时间或UTC时间。/etc/default/rcS,UTC=no,可以man rcS。date设置系统时间,hwclock 设置 hardware clock。
: tzselect
: 需要找一个精度很高的数值积分程序计算椭圆积分。
: 直接调用,svn.scipy.org/svn/scipy/trunk/scipy/special/specfun/specfun.f,fortran程序
: Bessel-&Butterworth-&Chebyshev II-&Chebyshelf I-&Elliptic filters 由左到右是从相位响应优先到幅度响应优先。
: IFS=&#newline#&for i in $(grep -ir &\.asc& dem* ) ; do #&\.asc&,加引号才转义 # echo $i echo -e &\n \n...............&done
: wget:有时候下载,只是前1分钟有数据传输,之后便是无响应。为了利用这个突发传输,增加请求的频率,可以编写脚本,也可以使用wget -T 20 -c url,20秒等待,缺省是900秒。
: LC Tank,sqrt(1/LC)虽然是谐振角频率,但出现了两个自由度, L和C,频率一定,即约束条件,LC=常数,则不同的C值,其选择性不同。再考虑并联的R,则R越大品质因数越大选择性越好,并联品质因数为R/sqrt(L/C),可见只考虑R
: 其实L和C的选择也很重要, 可设L为变量,频率一定,改变L观察选择性.
: Mathematica6的Manipulate函数,其中的第二个参数,即控制参数必须显式的出现在表达式参数中,如Manipulate[Plot[x*a,{x,0,4}],{a,1,3}]可以,但y=x*a;Manipulate[Plot[y,{x,0,4}],{a,1,3}]就不可行。
: Foundations of OscillatorCircuit DesignGuillermo Gonzalez
: Microwave Switches: Application Notes.www.herley.com/index.cfm?act=app_notes&notes=switches
: Fedora Electronic Lab,spins.fedoraproject.org/fel/#portfolio
: 有关geda和ngspice、gnu-cap的tutorial。ashwith.wordpress.com//circuit-simulation-in-gnulinux-lets-begin/
: National Semiconductor SPICE Macromodels。Op Amp SPICE & IBIS Models。 www.national.com/analog/amplifiers/spice_models
: type lsls is aliased to `ls --color=auto'
: type -a ls ls is aliased to `ls --color=auto' ls is /bin/ls
: Carl Albing, JP Vossen, and Cameron Newham,bash Cookbook,O’Reilly.2007
: 备份迷你博客:for i in {1..16};do wget http://hi.csdn.net/space-1862655-do-doing-view-me-page-$i.htmldone
: A minimum-phase transfer function is one where there are no zeros in the right-half of the s plane.Larry D. Paarmann Design and analysis of analog filters, p77
: active filter design:www.educypedia.be/electronics/electroniccalculatorsfilter.htm
: TI:Chapter16 Active Filter Design Techniques(Excerpted from Op Amps for Everyone)
: Active-Filter Cookbook D.Lancaster 1975,same as 2nd ed.
: PSpice for Filters and Transmission Lines Morgan and Claypool Publishers | 2007
: KiCad, kicad.sourceforge.net/wiki/Main_Page
: numpy array:横:[[[a,b]]],竖:[[[c],[d]]],纵:[[[e]],[[f]]]。四维:[[[[1,2],[3,4]],[[-1,-2],[-3,-4]]],[[[91,92],[93,94]],[[-91,-92],[-93,-94]]]]
: numpy.shape: 横(1,1,2),竖(1,2,1),纵(2,1,1),四维(2,2,2,2)
: numpy.reshape(, ( 外-&内 ) )
: mayavi2嵌入到wx,3.4的#from enthought.mayavi.core.ui.api import SceneEditor, MlabSceneModel对应3.2的from enthought.tvtk.pyface.scene_editor import SceneEditor
: from enthought.mayavi.tools.mlab_scene_model import MlabSceneModel
: The Visualization ToolKit (VTK) is an open source, freely available software system for 3D computer graphics, image processing, and visualization used by thousands of researchers and
developers around
: 动态演示的方案:gif, swf, 或 视频格式,gif的不足是颜色的限制,只有256色。png虽然可以支持更多的颜色,但不支持动画,只能期待APNG格式的普及。所以swf是选择之一,用png2swf工具转换也很方便。
: mayavi 中使用numpy.mgrid,若使用numpy.meshgrid则存在问题。
: 针对mlab.surf函数
: 编译wxwidget 报错 : /usr/include/wx-2.8/wx/utils.h:50: error: forward declaration of ‘struct wxFrame’, 原因是缺少libwxgtk2.8-dev
: PLplot:plplot.sourceforge.netVeusz:home.gna.orgoctaviz:octaviz.sourceforge.netUDAV:udav.sourceforge.netvisit:wci.llnl.gov/codes/visit/home.html
: mathgl:mathgl.sourceforge.net
: www.xmarks.com
: matplotlib错误:ValueError: Unknown projection '3d' .原因是把1.01的例子用在了0.99环境中。前者fig = plt.figure() ax = fig.add_subplot(111, projection='3d'),后者fig = pylab.figure() ax = axes3d.Axes3D(f
: ps2pdf - Convert PostScript to PDF using ghostscript. ps2pdf12 ps2pdf13
: for j in =*; do if [ -f $j ] ;done
: 批量下载eml文件,然后用for f in *. do munpack $f; done 提取附件,eml可用文本编辑器打开。
: Network: ERR-No Active Peers, Check Network Connection and Firewall.07:10:22.480 ERROR [JobQueue3 ] networkdb.reseed.ReseedChecker: Downloading peer router information for a new I2P installation
: 找个可行的.i2p folder替换
: Audacity(R) is free, open source software for recording and editing sounds. It is available for Mac OS X, Microsoft Windows, GNU/Linux, and other operating systems.
: GUI:wxWidgets
: firefox history:Win XP:C:\Documents and Settings\&user&\Application Data\Mozilla\Firefox\Profiles\&profilefolder&\places.sqlite,GNU/Linux:/home/&user&/.mozilla/firefox/&profilefo
: 作者的知识背景决定了所著书籍的内容倾向。GNU/Linux Application Programming, 2nd Edition M. Tim Jones就倾向于嵌入式应用。如对内核,虚拟化,编译工具链等方面的涵盖,,这都是开发嵌入式应用所需要的。
: Preemption (computing), ability of an operating system to stop a currently scheduled task in favour of a higher priority task.
: 运行echo &Beautiful day! & | festival --tts 提示Linux: can't open /dev/dsp。在Sound Preferences-&Hardware-Profile更改驱动为Digital Stereo Output+Analog stereo input 解决。
: espeak -p 10 -s 130 -f t.txt
: execl, execlp, execle, execv, execvp - execute a fileThese functions are front-ends for execve.
: Variadic function:In computer programming, a variadic function is a function of indefinite arity, i.e. one which accepts a variable number of arguments.
: python, 删除list的元素,a[-2:-1]=[]删除倒数第二个元素,但a[-1:0]并不能删除倒数第一个元素,要用a[-1:]=[],或者a.pop()
: 用cxfreeze生成的Win32程序在运行时提示“The application requires a version of wxPython greater than or equal to 2.8,but a mathching version was not found. ”
: 原因是py代码包含:import wxversion wxversion.ensureMinimal('2.8'),去掉即可。
: windows下的python:matplotlib-1.0.1.win32-py2.7.exe,numpy-1.5.1-win32-superpack-python2.7.exe,python-2.7.1.msi,wxPython2.8-win32-unicode-2.8.11.0-py27.exe
: linux:man 3 printf
: xvidcap1.1.7不从ubuntu仓储安装,直接到sourceforge.net/projects/xvidcap/页面下载,前者无声音对话框且录制无声音。
: 调试WR天线: 客户端固定并安装ssh,手机安装ssh与客户端通信监测客户端接收情况,同时调整WR天线。WR:wireless router
: 反射天线初步能提高7个dB左右,下一步研究衰减与距离的关系。
: debian , 待变
: virtuous circle,Vicious circle.en.wikipedia.org/wiki/Virtuous_circle_and_vicious_circle
: cramfs: sudo mount -o loop -t cramfs ./armbase_2.5.cramfs /mnt/arm-rfs/
: 6410开发板烧写了android2.2,用后感觉其对于非手机的设备支持有限。 继续关注。
: linux ec2: Amazon Elastic Compute Cloud (EC2)
: #sudo iwlist eth1 scanning Frequency:2.462 GHz (Channel 11) Quality:5/5 Signal level:-42 dBm Noise level:-92 dBm
: 感觉zf对网络的“丰索”更加严格了。 国外的有些网站做的很好,没有广告,又可以发文件(教学文件),但这也被禁止了。
: Karim Yaghmour, Jon Masters, Gilad Ben-Yossef, Philippe Gerum, &Building Embedded Linux Systems& O'Reilly Media, Inc. | ISBN:
| August 26, 2008
: Gene Sally,Pro Linux Embedded Systems,Apress,December 29, 2009
: Embedded Digital Signal Processing Systems.pdf
: Wiley.IEEE.Press.Embedded.Signal.Processing.with.the.Micro.Signal.Architecture.Feb.2007
: LabVIEW Experiments and Appendix Accompanying Embedded Signal Processing with the Micro Signal Architecture By Dr. Woon-Seng
: ftp://ftp.ni.com/pub/devzone/tut/exp_isbn_978_0_471_73841_1.pdf
: linux:dmesg - print or control the kernel ring buffer.The program helps users to print out their bootup messages.
: 无线路由器里 对于DHCP分配的机器和设置成固定IP的机器可见性不同.
: s3c6410的linux.编写脚本:ifconfig eth0 192.x.x.x up, route add default gw 192.x.x.x , echo nameserver 202.x.x.x & /etc/resolv.conf 。然后可用ftp, busybox里的wget等工具传文件.前提自建web或ftp server。
: 有时需更改MAC地址避免重复# ifconfig ethX down # ifconfig ethX hw ether NEW_MAC_ADDR # ifconfig ethX up
: The US Trade Representative (USTR) accused Baidu of steering consumers to third-party websites where pirated material is hosted.Critics accuse China of not protecting intellectual property
: 与youtube一样被封的还有wikipedia的图片服务器,公式图片也无法显示,可见对于不健康的东西是宁可错杀一千绝不放走一个。虽然可以用”爱兔癖“解决,但速度只有几kbps,期待好转。
: 2011年:只要dictionary文件做的好,wpa可以很快破解。
: 数独可以用递归算法求解,速度还挺快。在该类问题上递归和循环的区别是在速度和代码长度上,前者速度慢但代码短,后者速度快,但循环嵌套数大(数独需要81个)并且运行时不能改变,每一个循环的的代码都重复。
: 流传的用hosts文件指定域名的IP地址的方法来访问youtube似乎不可行,猜测为IP封锁。用代理可行,但一般都收费。其实youtube上还有很多教学视频,很健康的东西。
: 注意到迷你博客没有年份的显示,只有月日小时分钟。
: bt, spoonwep, spoonwpa, Gerix Wifi Cracker NG
: ReaView MDK-ARM中,通过创建Debug Functions打印数组的值(算法结果),然后进行验证。
: LMS 除了least mean square, 还有 learning management system ,如*Chamilo*Claroline*Democrasoft*Dokeos*eFront*ILIAS*Moodle*Sakai
: bit reverse algorithm, for (k=0, khat=0; k&N; k++) {X[khat]=x[k];for (bit=N/2; (khat & bit)!=0; bit &&=1)khat ^=khat ^=}
: RBIT Reverse the bit order in a 32-bit word,RBIT Rd, Rn Reverse Bits
: gcc编译c代码,提示“undefined reference to `sin' ”,或其他函数,cos等,原因是没有指定(数学)库文件libm.so,加上开关和参数 -lm 就可。
: 新买的优盘, 用MyDiskTest版本2.93 Beta测试,选坏块检测,提示有坏块,检测若干次,每次都提示有坏块,但位置在进度条中的显示不确定.用其他软件测试,通过.拷贝大文件,占满优盘,然后sha1sum校验,无误.疑MyDiskTest误报.
: UM0600User manualSTM3210C-EVALevaluation board
: OTP (one-time programmable). White Paper Thin-Film-Transistor (TFT) LCD Display Control Electronics Design and Operation Revision 1.0 DENSITRON TECHNOLOGIES plc.
: common voltage (VCOM)
: 名称 :autorun.inf 大小 : 87432 byte SHA1 : 5254bedd866db160df357cb94800ebeea1fdb36b http.virscan.org
: 发现的病毒
: support.microsoft.com/kb/962007
: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Schedule start REG_DWORD 原始为2 修改为4
: http://www.kaspersky.com/support/downloads/utils/kk.zip
: filter design tool: www.circuitsage.com/filter.html
: FilterLab_ microchip
: Mr filter: An active filter design assistant on linux
: ValueError: itemsize mismatch: audio_alsa_source(1):0 using 4, xxxxxxx:0 using 8, 原因为source和sink类型不匹配,如source输出为浮点,但sink要求输入为复数。
: Signal Processing Blocks中的Type Conversions里有相应的类可以进行类型转换。
: python: import module dir(module)
: All three interrupt lines are ORed together to a single channel of the vectored interrupt controller. OR AND XOR NOT
: uint8_t bL 0x12uint8_t bDescriptorT 0x1uint16_t bcdUSB;0x200uint8_t bDeviceC0x0uint8_t bDeviceSubC0x0uint8_t bDeviceP0x0uint8_t bMaxPacketSize0;0x8
: uint16_t idV0x46d uint16_t idP0xc00e uint16_t bcdD0x1110 uint8_t iM0x1 uint8_t iP0x2 uint8_t iSerialN0x0 uint8_t bNumC0x1
: 鼠标的Device Descriptors
: usb_device_descriptor, idVendor, idProduct. www.linux-usb.org/usb.ids
: ldd - print shared library dependencies. gcc XX -L/usr/lib -lusb, 对应libusb.so
2010年迷你博客
: If the declaration of an identifier for an object has file scope and an initializer, thedeclaration is an external definition for the identifier. --c99 pp157
: getopt.h中,char *const *___argv是指向 指向字符串的指针常量 的指针。
: c++中,char *cp=&A,B,C,D,E&语句将产生提示:deprecated conversion from string constant to ‘char* ’
: c99:INTERNATIONAL STANDARD ISO/IEC 9899 Second edition
Programming languages — C
: A function declaration can contain the storage-class specifier static only if it is at file scope。--c99
: #include &string.h&和#include &string& 是两个不同的库,前者是/usr/include/string.h,后者是/usr/include/c++/x.x/string。
: Package: manpages-dev (3.21-1) ,Manual pages about using GNU/Linux for development.These man pages describe the Linux programming interface.
: 包含sysconf(3),因为getconf(1)需要参考sysconf(3)
: 例:getconf HOST_NAME_MAX
: uname - print system information . -r, --kernel-release print the kernel release
: 用脚本将project中的GB格式的源文件批量转换成UTF,这里用到tcs程序. for i in $(find | grep -i &\.[hc]$&) do tcs -f gb $i & $i.t mv $i.t $idone
: Opengrok在ubuntu9.04,tomcat6下的安装需要更改init.d的tomcat6脚本中关于java的安全设定才能工作,参考: w.livedoor.jp/sanou/d/%A5%A4%A5%F3%A5%B9%A5%C8%A1%BC%A5%EB%CA%FD%CB%A1(Ubuntu%209.04)
: 否则会出现 HTTP Status 404 The requested resource () is not available. 的错误
: Opengrok对中文的显示还是乱码,有待解决。
: 源文件的中文为GB编码,用OpenOffice等软件将其转换为UTF8就可正确显示。
: /var/lib/tomcat6/webapps/source/WEB-INF/web.xml
: /var/opengrok/etc/configuration.xml
: property=&sourceRoot&
: Code Navigation of Eclipse CDT: Outline View, Project File Views, Open declarations, Open definitions.
: source insight, cscope, Source navigator, www.lemis.com/grog/software/source-code-navigation.php,
: OpenGrok --Sun Microsystems
: Don't use the keyword extern to create an use it only to refer to an existing external definition.
: Duration:Automatic, static
: Scope: Block, File
: Linkage:None, External, Internal
: C language
: ubuntu9.04的synaptic package manager里有eclipse CDT,但9.10里没有, 9.10需要从eclipse里安装CDT.打开eclipse-&help-&Install new software... ,work with 是要选择一个download site。
: 新建一个指向download.eclipse.org/releases/galileo/的站点
: 安pydev也一样,站点选择 h ttp://pydev.org/updates
: LPC17xx中的pin mode针对输入的状态,当pull-up时,引脚float对应1,可接开关连地,当pull-down时可接开关连电源,当repeater时,若引脚低,则pull-down,引脚高则pull-up,引脚输入移走,输入状态不变。
: The PINMODE registers control the input mode of all ports.
: &USB Design By Example&一书的作者John Hyde在其主页上表示该书不会出第3版,并不建议购买,而是推荐Jan Axelson's的 'USB Complete, Fourth Edition'
: HDG12864F-1或HDG12864L-6的手册内容过于简略时可以查看其驱动芯片SED1565的手册。
: instruction cycle , sometimes called fetch-and-execute cycle, fetch-decode-execute cycle, or FDX.指令周期
: 英文版的xp运行中文应用程序乱码问题control panel&Regional and Language Options&Advanced tab&Select a language to match the language version of the non-Unicode Programs you want to use选Chines
: 选Chinese(PRC)
: Keil MDK 4.13与TKScope ARM V1.00不兼容,点击degug按钮时MKD退出,换用Keil MDK 3.8问题解决,可以调试。
: TKscope ARM V1.00 Release 10/2009
: MOV R3, #(PLLCON_PLLE:OR:PLLCON_PLLC), 其中 :OR: 为armasm precedence,——ARM Compiler toolchain Using the Assembler Version 4.1-&Symbols, Literals, Expressions, and Operators -& Addition,
: PLL_BASE EQU 0xE01FC080 ; PLL Base Address LDR R0, =PLL_BASE; 32位立即数0xE01FC080将存放于内存当中,地址为0x,属于LPC21xx On-Chip Non-Volatile Memory
: 0xF00A0 LDR R0,[PC,#0x00A0],PC为0x的值在执行该指令后为PC+0x00A0+0x8即0x100为首地址的4字节的内容。为什么再加0x8,为0x100而不是0xf8?
: stackoverflow.com/questions/2102921/strange-behaviour-of-ldr-pc-value
: It is recommended to write PC-relative expressions using labels rather than PC because the value of PC depends on the instruction set.Note *In ARM state, the value of the PC is the address
of the cur
: ARM Compiler toolchain Using the Assembler Version 4.1 -& Symbols, Literals, Expressions, and Operators -& Register-relative and PC-relative expressions
: LDR PC, Reset_A将Reset_Addr指向的内存内容传给PC寄存器Reset_Addr DCD Reset_H将Reset_Handler的标签地址存入内存Reset_Handler ...[instruction];标签
: LPC头文件中,(*((volatile unsigned long *) 0xE0028000)), 指向unsigned long的指针的值为0xE0028000,整个表达式是指针指向的内容,即寄存器的内容,寄存器地址为0xE0028000。
: RealView MDK-ARM 4.13a生成的Hex文件无法在Proteus 7.5中运行的原因是fromelf生成的Hex文件与RV MDK-ARM 3.2生成的有一点区别,主要是前者少了第一行和多了倒数第二行。
: 第一行添加:0000F7,然后删除倒数第二行。
: ARM的LDR伪指令的作用是将32位的立即数或地址(32位)存入寄存器,因为ARM的指令为32位,所以不能在一条指令里包含32位的立即数。
: ubuntu下启动ARM → RealView Development Suite v4.1 → RealView Debugger v4.1无反应,在shell下执行,报错error while loading shared libraries: libXm.so.3: cannot open shared object file: No such file or
: 需安装libmotif3包
: RVDS报错,Unhandled event loop exception No more handles (java.lang.UnsatisfiedLinkError: no swt-mozilla-gtk-3349 or swt-mozilla-gtk in swt.library.path, java.library.path or the jar file)
: ubuntu9.10下虽安了xulrunner-1.9.1但不兼容,需要安装xulrunner
: 在ubuntu下用命令行形式编译链接源文件,需要指定include和lib路径,如armcc -I /rvdsdir/RVCT/Data/4.1/561/include/unix ... , armlink --libpath /rvdsdir/RVCT/Data/4.1/561/lib/...
: 可以设置环境变量,ARMCC41LIB=/rvdsdir/RVCT/Data/4.1/561/lib/
: ARMCC41INC=/rvdsdir/RVCT/Data/4.1/561/include/unix/
: 申请arm的license的时候用的无线网卡的MAC,本机是eth2,但hostid只读取eth0,这可通过修改/etc/udev/rules.d下的文件内容解决。使eth0为无线网卡。
: arm给的评估license不好用,因为可能不适用于浮动的,需要修改,添加SERVER servername hostid 8224和DAEMON armlmd两条语句,另外对于ubuntu还需对/usr/tmp有写的权力。
: proteus的ARM和uclinux例子里有dungeon,MUD的前身,基于文本的游戏,可以用在教育领域。
: 用linux的at命令实现倒计时闹钟,at now+10minutes 回车,在at&提示后输入编好的bash脚本,如启动音乐播放器等,例如输入/home/xiajing/mycrontab.sh,mycrontab.sh的内容是 gedit。
: ctrl+D 结束
: bash脚本的内容是gedit --display=:0.0,或不用display参数,但前面要export DISPLAY环境变量
: ubuntu下的RVDS安装,下载的RVDS有evaluation的 license.dat,需要设置flexnet的 client license,对于Linux只能是浮动的,设置变量ARMLMD_LICENSE_FILE=8224@my_server export ARMLMD_LICENSE_FILE
: 详见FLEXnet for ARM Tools License Management Guide
: 可以在命令行下运行armasm测试是否设置成功,armasm会检测license.
: AFAIR - As Far As I Remember
: RS232 null modem cables
: aMule添加多个链接,对于保存的htm源文件执行 grep -ir href=\&ed2k * &t.txt ,然后对t.txt中的多余语句进行替换。然后拷贝至aMule, Commit.
: 太深奥了
: 主要是针对aMule无法响应web上的ed2k链接,所以要提取页面源文件中的多个ed2k链接。
: arm tool chain,www.ibm.com/developerworks/linux/library/l-arm-toolchain/index.html
: www.eetimes.com/design/embedded/4007119/Building-Bare-Metal-ARM-Systems-with-GNU-Part-1--Getting-Started
: 国产手机的常用Arm芯片如mtk的,mt6226,不过手册不好找。
: download ARM Evaluation, MDK413A.EXE (250,130K) Friday, October 29, 2010,Programs that generate more than 32 Kbytes of code and data will not compile, assemble, or link.
: www.keil.com/demo/limits.asp
: www.embedinfo.com 英蓓特
: lpc21xx,data sheet, user manual, application notes
: 笔记本,调节屏幕亮度,如果Fn+上下箭头不起作用,可以试试 sudo setpci -s 00:02.0 F4.B=88
: thinkpad?
: 对,联想的
: 什么型号的?
: libgloss,有startup code
: 自制简易的示波器,www.jyetech.com
: 手写输入识别日韩文适用于翻译印刷品上的日韩文,youdao。
: Springer-Remote Sensing with Imaging Radar-John A. Richards 2009
: processing of SAR Data: Fundamentals, Signal Processing, Interferometry
: Digital Processing Of Synthetic Aperture Radar Data: Algorithms And Implementation (Artech House Remote Sensing Library) [Hardcover] Ian G. Cumming (Auth
: opera mobile中,点住控制键模拟鼠标右键。
: ImageMagick,density参数可指定图片的分辨率,尤其是矢量转成位图时。convert -density 200x xj.pdf xj.gif
: latex中,\usepackage{geometry} \geometry{papersize={120mm,140mm}} 可以任意改变纸张大小而不用在latex命令后加参数如a4, b5等。适合单纯作图使用。
: Python Imaging Library (PIL) ,将pdf转换为gif以适于web。
: 用imagemagick
: 电路仿真的算法。Lawrence T. Pillage, Ronald A. Rohrer, Chandramouli Visweswariah, &Electronic Circuit and System Simulation Methods“,1994 | ISBN:
| 392 pages
: pgf\tikz中,\foreach \r in {0,1,...,0}将产生两个值,0和1,这样在双重循环中,\foreach \r in {0,1,...,2} \foreach \l in {0,1,...,\r} 第一个值需要在循环外实现。
: 相位是频率与时间的乘积的前提是频率是常数,更确切的说法是相位是频率对时间的积分,如果是空间频率k,那就是k对长度u的积分。
: pgf/tikz中改变箭头大小。\draw[blue,decoration={markings,mark=at position 1 with {\arrow[blue,scale=2]{latex}}}, postaction={decorate}, shorten &=5pt] (XP)--(\xjx,\xjyn);
: pgf/tikz中提取坐标的x分量或y分量。\coordinate (XP) at ($(U)!1!atan((\xjyn-\xju)/\xjx)-atan((-\xju)/\xjx):(\xjx,0) $);\newdimen\xjxpx\pgfextractx{\xjxpx}{\pgfpointanchor{XP}{center}};
: 可用\ifthenelse{\xjxpx & \xjxxx}{true语句}{false语句},但\xjxxx也得用\pgfextractx/y获得。类型一致
: latex, animation包。&variable name& is a sequence of one or more letters without a leading back-slash1 .The first (and possibly only) letter of the variable name determines the type of
: The first (and possibly only) letter of the variable name determines thetype of the variable.
: There are three different types: integers (‘i’, ‘I’), reals(‘n’, ‘N’, ‘r’, ‘R’) and dimensions or LaTEX lengths (‘d’, ‘D’).
: 两本MCU的书,Newnes_PIC Microcontrollers_know it all_Lucio Di Jasio 2008, ROGRAMMING AND CUSTOMIZING THE PIC(R) MICROCONTROLLER_MYKE PREDKO_2008
: pgf/tikz中,有时用\coordinate (E) at ($(D)!(U)!(Y)$);计算的坐标误差很大。可以掉换为(Y)(U)(D)以减小误差。
: MATLAB中,publish(&file.m&)对于%%标识的cell中的多个plot只输出最后一个plot的曲线,解决的办法是每个cell只放一个plot,或使用snapnow函数。
: tikz中, dash pattern=on 2pt off 3pt on 4pt off 4pt, dash phase=10pt, loosely dotted,dotted,densely dotted, loosely dashed,dashed, densely dashed.
: matlab中,a=-6:6,a.*(abs(a)&4),置零操作。
: numpy中也有类似操作,a=np.range(5),2*(a&3)
: ubuntu下用eric4.3,自动补全时只要显示待选项窗口,键盘就僵住,只能用鼠标。
: transformer hybrid,Practical Transformer Handbook: for Electronics, Radio and Communications Engineers
: Double transformer hybrid
: A hybrid coil (or bridge transformer, or sometimes hybrid) is a transformer that has three windings,and which is designed to be configured as a circuit having 4 branches, that are conjugate
: pfg/tikz中,\draw [pattern=grid](0,0) circle(3);用xelatex编译会提示your graphic driver pgfsys-xetex.def does not support patterns,可以用pdflatex编译
: pfg/tikz中,可以进行多次坐标变换,如多次平移:\draw [shift={(30:0.5)},shift={(\x,0)}](0,0)--(30:3);
: 不过用shift时,后面的坐标似乎不能是事先定义的如(A), (B)等。
: 可以用类似($(A)+(angle:radius)$)坐标计算解决
: latex,\documentclass[9pt,b5paper]{article}中的b5paper只是设定正文宽度,长度等,生成的pdf还是A4的。要设定纸张,还需在编译命令后加-papersize b5。
: PGF/TikZ中,\draw[line join=round] ,\draw[line join=bevel] ,\draw[line join=miter] ,指定不同折点的形状。
: pgf/tikz中,\draw [color=blue, fill=blue!20, thick,domain=-3*pi:3*pi, samples=501] plot (\x,{1.5*sin(3*\x r)/\x/3}) |-(0,0);注意color和fill的顺序不要颠倒,另外fill会把path的首尾自动连接形成闭合然后填充,所
: 所以首尾要落在x轴上, plot生成path,后可加节点,如|-(0,0)
: beamer中,\usepackage[table]{xcolor}会报错,解决的办法是\documentclass[xcolor=table..]{beamer}
: \rowcolors{&starting row&}{&odd color&}{&even color&}
: % Enter this in the cell you wish to color a light grey. \cellcolor[gray]{0.9}
: 1.McGraw-Hill (November 10, 2008)_PRACTICAL ARRAY PROCESSING Mark Sullivan.2.Array Signal Processing: Concepts and Techniques [Facsimile] [Paperback]Don H. Johnson
: 增量为B的模A运算的周期.设A,B为正整数且A&B,C=kB mod A, k=0,1,2,3...,则C的周期为A(B/G)/B=A/G, 其中G=GCD(A,B).证明思路设D=A mod B,则D/G与B/G互质,推出D/G*G与B/G互质,即D与B/G互质,D/G与B互质,因此A(B/G)为A
: D/G与B互质,因此A(B/G)为A与B的最小公倍数,所以周期为A/G
: pgf中\draw[decorate,decoration=brace](-0.2,-1.05)--(-0.2,-0.45);的brace在snake库里
: python里的bin,hex,oct函数很方

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