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Copy values from one column to another in the same table
...sions where developers have thought like laymen.
– Zaxter
Mar 6 '16 at 11:35
9
Careful if you are...
JavaScript “new Array(n)” and “Array.prototype.map” weirdness
I've observed this in Firefox-3.5.7/Firebug-1.5.3 and Firefox-3.6.16/Firebug-1.6.2
14 Answers
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What are the mathematical/computational principles behind this game?
...
Finite Projective Geometries
The axioms of projective (plane) geometry are slightly different than the Euclidean geometry:
Every two points have exactly one line that passes through them (this is the same).
Every two lines meet in exactly one point (this is...
Who is listening on a given TCP port on Mac OS X?
On Linux, I can use netstat -pntl | grep $PORT or fuser -n tcp $PORT to find out which process (PID) is listening on the specified TCP port. How do I get the same information on Mac OS X?
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Python multiprocessing pool.map for multiple arguments
...of Python, you'll need to write a helper function to unpack the arguments explicitly. If you want to use with, you'll also need to write a wrapper to turn Pool into a context manager. (Thanks to muon for pointing this out.)
import multiprocessing
from itertools import product
from contextlib import...
Visual Studio can't build due to rc.exe
...ound this on Google... I would assume that in your case you would copy rc.exe and rcdll.dll to visual studio 2012\vc\bin or wherever you have it installed:
Part 2: FIX LINK : fatal error LNK1158: cannot run ‘rc.exe’
Add this to your PATH environment variables:
C:\Program Files (x86)\Win...
Days between two dates? [duplicate]
...s assumed "days" refers to just the day portion of the difference. So for example difference between 2010 and 2011 would be 0 days and 1 year, but turns out it does report 365 days as I wanted.
– Bemmu
Nov 25 '11 at 10:03
...
Using property() on classmethods
...ect):
... _var = 5
... class __metaclass__(type): # Python 2 syntax for metaclasses
... pass
... @classmethod
... def getvar(cls):
... return cls._var
... @classmethod
... def setvar(cls, value):
... cls._var = value
...
>>> foo.__metacl...
How to avoid overflow in expr. A * B - C * D
I need to compute an expression which looks like:
A*B - C*D , where their types are: signed long long int A, B, C, D;
Each number can be really big (not overflowing its type). While A*B could cause overflow, at same time expression A*B - C*D can be really small. How can I compute it correctly...
jQuery: Return data after ajax call success [duplicate]
... can pass in a callback function that handles the result:
function testAjax(handleData) {
$.ajax({
url:"getvalue.php",
success:function(data) {
handleData(data);
}
});
}
Call it like this:
testAjax(function(output){
// here you use the output
});
// Note: the call won'...