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Call apply-like function on each row of dataframe with multiple arguments from each row
...of a and b. The ... allows irrelevant args to be passed without causing an error:
do.call( function(x,z,...) testFunc(x,z), df )
For non-vectorized functions, mapply will work, but you need to match the ordering of the args or explicitly name them:
mapply(testFunc, df$x, df$z)
Sometimes apply...
Does Python have a package/module management system?
... even mention Pip. Instead, it led them down an archaic and tedious path.
Error: Unable to find vcvarsall.bat
Numpy is one of Python's most popular libraries. Try to install it with Pip, you get this cryptic error message:
Error: Unable to find vcvarsall.bat
Trying to fix that is one of the ...
php动态安装mysql扩展错误（ext/mysqlnd/mysqlnd.h: No such file or direc...
...
/data/xingzheng/software/php-5.5.10/ext/mysql/php_mysql_structs.h:39:33: error: ext/mysqlnd/mysqlnd.h: No such file or directory
In file included from /data/xingzheng/software/php-5.5.10/ext/mysql/php_mysql_structs.h:40,
from /data/xingzheng/software/php-5.5.10/ext/mysql/php_m...
Unable to execute dex: GC overhead limit exceeded in Eclipse
...ed the Git project OsmAnd and went to compile it,
Eclipse returned these errors:
9 Answers
...
How does the SQL injection from the “Bobby Tables” XKCD comic work?
...es around the arguments is rather unusual, but at least it avoids a syntax error... :-)
– PhiLho
Dec 2 '08 at 20:00
60
...
Fragments within Fragments
...that Fragment happens to use child fragments, it doesn't fail with a clear error ("can't add child fragments to layout fragments")--it fails mysteriously with exceptions like "fragment did not create a view". There goes several hours of time debugging...
– Glenn Maynard
...
ASP.NET MVC Conditional validation
...eld (e.g. if A=true, then B is required), while maintaining property level error messaging (this is not true for the custom validators that are on object level) you can achieve this by handling "ModelState", by simply removing unwanted validations from it.
...In some class...
public bool Propert...
Linux equivalent of the Mac OS X “open” command [closed]
...en &>/dev/null' yields approximately the desired behavior (although errors from xdg-open itself (as opposed to just the launched program) would also be silenced, which is undesirable).
– Max Nanasy
Nov 16 '12 at 10:04
...
Why is the gets function so dangerous that it should not be used?
... head the trouble off sooner rather than later. I'd be prepared to add an error message:
fputs("obsolete and dangerous function gets() called\n", stderr);
Modern versions of the Linux compilation system generates warnings if you link gets() — and also for some other functions that also have s...
How do I execute a command and get the output of the command within C++ using POSIX?
...pipe(popen(cmd, "r"), pclose);
if (!pipe) {
throw std::runtime_error("popen() failed!");
}
while (fgets(buffer.data(), buffer.size(), pipe.get()) != nullptr) {
result += buffer.data();
}
return result;
}
Pre-C++11 version:
#include <iostream>
#include <...