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How do I combine two data frames?
I'm using Pandas data frames. I have a initial data frame, say D . I extract two data frames from it like this:
6 Answers
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驯服Linux OOM Killer（优质英文资料翻译） - 操作系统(内核) - 清泛网移动...
驯服Linux OOM Killer（优质英文资料翻译）Taming-the-OOM-killer全面介绍Linux OOM Killer的内部原理，原文为英文，Google翻译+校对，若翻译不佳请参考原文，谢谢。在极低的内存条件下， OOM（out-of-memory） Killer会启动并使用一组随时间演变...
docker mounting volumes on host
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The VOLUME command will mount a directory inside your container and store any files created or edited inside that directory on your hosts disk outside the container file structure, bypassing the union file system.
The idea is that your vol...
How to use permission_required decorators on django class-based views
I'm having a bit of trouble understanding how the new CBVs work. My question is this, I need to require login in all the views, and in some of them, specific permissions. In function-based views I do that with @permission_required() and the login_required attribute in the view, but I don't know how ...
Timer function to provide time in nano seconds using C++
...ed about running the function repeatedly in a loop is correct.
For Linux (and BSD) you want to use clock_gettime().
#include <sys/time.h>
int main()
{
timespec ts;
// clock_gettime(CLOCK_MONOTONIC, &ts); // Works on FreeBSD
clock_gettime(CLOCK_REALTIME, &ts); // Works on Li...
Does the ternary operator exist in R?
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As if is function in R and returns the latest evaluation, if-else is equivalent to ?:.
> a <- 1
> x <- if(a==1) 1 else 2
> x
[1] 1
> x <- if(a==2) 1 else 2
> x
[1] 2
The power of R is vectorization. The vectorization of t...
Is memcached a dinosaur in comparison to Redis? [closed]
I have worked quite a bit with memcached the last weeks and just found out about Redis. When I read this part of their readme, I suddenly got a warm, cozy feeling in my stomach:
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Nohup is not writing log to output file
I am using the following command to run a python script in the background:
6 Answers
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How do I remove the old history from a git repository?
...e graft, it takes effect right away; you should be able to look at git log and see that the unwanted old commits have gone away:
$ echo 4a46bc886318679d8b15e05aea40b83ff6c3bd47 > .git/info/grafts
$ git log --decorate | tail --lines=11
commit cb3da2d4d8c3378919844b29e815bfd5fdc0210c
Author: Your ...
Differences between fork and exec
What are the differences between fork and exec ?
9 Answers
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