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Error installing libv8: ERROR: Failed to build gem native extension
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614
try this one:
gem install libv8 -v '3.16.14.3' -- --with-system-v8
Note : Because libv8 i...
Spring vs EJB. Can Spring replace EJB? [closed]
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4 Answers
4
Active
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How to find out what type of a Mat object is with Mat::type() in OpenCV
... CV_32S: r = "32S"; break;
case CV_32F: r = "32F"; break;
case CV_64F: r = "64F"; break;
default: r = "User"; break;
}
r += "C";
r += (chans+'0');
return r;
}
If M is a var of type Mat you can call it like so:
string ty = type2str( M.type() );
printf("Matrix: %s %dx%d \...
Sorting a Python list by two fields
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edited Sep 4 '15 at 8:54
BrechtDeMan
5,52433 gold badges2121 silver badges2424 bronze badges
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Capture iframe load complete event
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gblazexgblazex
44.3k1111 gold badges8888 silver badges8585 bronze badges
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Get the first element of each tuple in a list in Python [duplicate]
...r x in rows]
Below is a demonstration:
>>> rows = [(1, 2), (3, 4), (5, 6)]
>>> [x[0] for x in rows]
[1, 3, 5]
>>>
Alternately, you could use unpacking instead of x[0]:
res_list = [x for x,_ in rows]
Below is a demonstration:
>>> lst = [(1, 2), (3, 4), (...
C++ STL Vectors: Get iterator from index?
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answered Mar 22 '09 at 18:42
dirkgentlydirkgently
98.7k1616 gold badges119119 silver badges180180 bronze badges
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How to fully remove Xcode 4
I want to remove all existing SDK versions as well as Xcode 4.
7 Answers
7
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Why aren't python nested functions called closures?
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403
A closure occurs when a function has access to a local variable from an enclosing scope that h...