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What are the mathematical/computational principles behind this game?
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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...
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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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...
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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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...
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...
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'...
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...
iPhone: How to switch tabs with an animation?
...ally in a tab bar driven application using UITabBarController.selectedIndex . The problem I'm trying to solve is how to animate the transition between the views. ie. from the view of the current tab to the view of the selected tab.
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