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Visual Studio keyboard shortcut to automatically add the needed 'using' statement
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3
Wow, didn't know about Ctrl+. or Alt+Shift+F10, but always wondered if there was such a short-cut. I also have a function lock keyboard, bu...
how to convert from int to char*?
...ar const *pchar = s.c_str(); //use char const* as target type
And in C++03, what you're doing is just fine, except use const as:
char const* pchar = temp_str.c_str(); //dont use cast
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im...
Check if a Class Object is subclass of another Class Object in Java
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edited Mar 23 at 8:00
Joachim Sauer
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How do I execute a program from Python? os.system fails due to spaces in path
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301
subprocess.call will avoid problems with having to deal with quoting conventions of various sh...
snprintf and Visual Studio 2010
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nwellnhof
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answered Jan 3 '12 at 13:28
Valentin MileaValentin Milea
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Automatically expanding an R factor into a collection of 1/0 indicator variables for every factor le
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131
Use the model.matrix function:
model.matrix( ~ Species - 1, data=iris )
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When is assembly faster than C?
...out floating point, they shine when it comes to precision as they give you 32 bits of precision with a predictable error (float only has 23 bit and it's harder to predict precision loss). i.e. uniform absolute precision over the entire range, instead of close-to-uniform relative precision (float).
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How to convert a factor to integer\numeric without loss of information?
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734
See the Warning section of ?factor:
In particular, as.numeric applied to
a factor is mean...
error C2662: “Screen::move”: 不能将“this”指针从“const Screen”转...
... {os<<contents;}
//main中处理
int main()
{
Screen myScreen(5,3);
const Screen blank(5,3);
//调用非const版本display
myScreen.display(cout).set('#').display(cout);
cout << endl;
//调用 const版本display
blank.display(cout);
return 0;
}
这...