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Applying a function to every row of a table using dplyr?
When working with plyr I often found it useful to use adply for scalar functions that I have to apply to each and every row.
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Unable to execute dex: Multiple dex files define Lcom/myapp/R$array;
...ctory in my build path, and I had the support library in the "libs" folder for support of ant building. I unchecked one and it fixed my issue.
– Chris Feist
Aug 14 '13 at 19:03
20...
“for loop” with two variables? [duplicate]
How can I include two variables in the same for loop?
8 Answers
8
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How to verify if a file exists in a batch file?
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You can use IF EXIST to check for a file:
IF EXIST "filename" (
REM Do one thing
) ELSE (
REM Do another thing
)
If you do not need an "else", you can do something like this:
set __myVariable=
IF EXIST "C:\folder with space\myfile.txt" set __myVar...
JavaScript: Class.method vs. Class.prototype.method
... vs ES2015 but in conversation people often resort to a shorter convention for efficiency, so I think removing it from writing is not possible or for sure advisable.
– wuliwong
Dec 17 '19 at 18:46
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Mercurial .hgignore for Visual Studio 2010 projects
Not to be confused with Mercurial .hgignore for Visual Studio 2008 projects
2 Answers
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Debug Error \"pure virtual function call\" 原因解析 - 更多技术 - 清泛...
...
public:
virtual void virtualFunc(){}
};
Base* pB = new Derived;
__try
{
delete pB; // . . . b)
pB = NULL;
}
__except(EXCEPTION_EXECUTE_HANDLER){
}
pB->virtualFunc(); // . . . c)
在b)处析构Derived对象的时候，在其基类析构函数中a)处抛出了...
Why doesn't Internet Explorer 11 honour conditional comments even when emulating Internet Explorer 8
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According to Jacob Rossi [MSFT]
This should be fixed in Update 1 for IE11, released last week.
That was posted on April 22, 2014.
In running a few tests myself it does appear that this was fixed and all is running smoothly again for testing the most amazing browser ever produced...Inte...
Intro to GPU programming [closed]
...has this huge massively parallelized supercomputer on their desktop in the form of a graphics card GPU.
9 Answers
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NGINX to reverse proxy websockets AND enable SSL (wss://)?
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Just to note that nginx has now support for Websockets on the release 1.3.13. Example of use:
location /websocket/ {
proxy_pass http://backend_host;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "up...