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Remove last character from C++ string
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Matthieu M.Matthieu M.
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How to change string into QString?
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edited Oct 18 '15 at 12:54
answered Nov 29 '09 at 0:00
Kam...
Grouping functions (tapply, by, aggregate) and the *apply family
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1344
+100
R has m...
sprintf like functionality in Python
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edited Dec 14 '12 at 12:25
answered Mar 15 '11 at 9:57
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Deep Learning（深度学习）学习笔记整理系列之（三） - 大数据 & AI - 清泛...
...zouxy09@qq.comhttp: blog.csdn.net zouxy09作者：Zouxyversion 1.0 2013-04-08原文网址：h...Deep Learning（深度学习）学习笔记整理系列
zouxy09@qq.com
http://blog.csdn.net/zouxy09
作者：Zouxy
version 1.0 2013-04-08
原文网址：http://blog.csdn.net/zouxy09/article/detai...
C++ SFINAE examples?
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John Kugelman
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answered Jun 11 '09 at 18:54
Greg RogersGreg Rogers
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How to add a new audio (not mixing) into a video using ffmpeg?
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Replace audio
ffmpeg -i video.mp4 -i audio.wav -map 0:v -map 1:a -c:v copy -shortest output.mp4
The -map option allows you to manually select streams / tracks. See FFmpeg Wiki: Map for more info.
This example uses -c:v copy to stream copy (mux) the video....
How to write DataFrame to postgres table?
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Starting from pandas 0.14 (released end of May 2014), postgresql is supported. The sql module now uses sqlalchemy to support different database flavors. You can pass a sqlalchemy engine for a postgresql database (see docs). E.g.:
from sqlalchemy im...
搭建高可用mongodb集群（一）——配置mongodb - 大数据 & AI - 清泛网 - 专...
...安装程序包
wget http://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.4.6.tgz
#解压下载的压缩包
tar xvzf mongodb-linux-x86_64-2.4.6.tgz
#进入mongodb程序执行文件夹
cd mongodb-linux-x86_64-2.4.6/bin/
3、启动单实例mongodb
mongod --dbpath /data/mongodbtest/...
Difference between a Structure and a Union
...ing it's undefined. On most modern machines a char is 1 byte and an int is 4 bytes, so giving x.b the value 'c' also gives the first byte of x.a that same value:
union foo x;
x.a = 3;
x.b = 'c';
printf("%i, %i\n", x.a, x.b);
prints
99, 99
Why are the two values the same? Because the last 3 byt...