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Why use apparently meaningless do-while and if-else statements in macros?
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#define BAR(X) do { \
int i = f(X); \
if (i > 4) g(i); \
} while (0)
You don't have to use do ... while, you could cook up something with if ... else as well, although when if ... else expands inside of an if ... else it leads to a "dangling else", which could make an existing dangling el...
How can I sharpen an image in OpenCV?
...f frame into image: (both cv::Mat)
cv::GaussianBlur(frame, image, cv::Size(0, 0), 3);
cv::addWeighted(frame, 1.5, image, -0.5, 0, image);
The parameters there are something you need to adjust for yourself.
There's also Laplacian sharpening, you should find something on that when you google.
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Rename an environment with virtualenvwrapper
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210
You can use:
cpvirtualenv oldenv newenv
rmvirtualenv oldenv
So in your case:
cpvirtualenv do...
css rotate a pseudo :after or :before content:“”
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370
Inline elements can't be transformed, and pseudo elements are inline by default, so you must app...
What is the difference between Reader and InputStream?
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dimo414
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answered Dec 6 '10 at 14:54
Berin Lorits...
Interface Builder: What are the UIView's Layout iOS 6/7 Deltas for?
...ffect, it is overlaid on top of your view. So if you put a UI element at (0.0, 0.0) on iOS6, it will appear below the status bar, but on iOS7 it would appear partially covered underneath the status bar. So in that case you would want a delta that matches the status bar height (20.0 points) so that...
Can I assume (bool)true == (int)1 for any C++ compiler?
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edited Apr 27 '10 at 21:14
Joe
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ans...
How to sum a variable by group
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404
Using aggregate:
aggregate(x$Frequency, by=list(Category=x$Category), FUN=sum)
Category x
1...
Convert to binary and keep leading zeros in Python
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Use the format() function:
>>> format(14, '#010b')
'0b00001110'
The format() function simply formats the input following the Format Specification mini language. The # makes the format include the 0b prefix, and the 010 size formats the output to fit in 10 characters ...
Git merge left HEAD marks in my files
...D <-+ remove the bits here
digits:[0-9]+ |
{ return digits.join(""); } |
======= <-+
sign:"-"* digits:[0-9]+
{ return sign + digits.join(""); }
>>>&...