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Algorithm to detect corners of paper sheet in photo
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John_West
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answered Jul 10 '11 at 22:47
Daniel CrowleyDani...
How do I install an old version of Django on virtualenv?
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There was never a Django 1.0.7. The 1.0 series only went up to 1.0.4. You can see all the releases in the tags section of the Django code repository.
However to answer your question, don't use easy_install, use pip. (If it's not already installed, do ...
How to find out the number of CPUs using python
...thony Sottile
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answered Jun 17 '09 at 10:53
Nadia AlramliNadia Alramli
94...
Replace a value if null or undefined in JavaScript
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Here’s the JavaScript equivalent:
var i = null;
var j = i || 10; //j is now 10
Note that the logical operator || does not return a boolean value but the first value that can be converted to true.
Additionally use an array of objects instead of one single object:
var options = {
...
How does collections.defaultdict work?
...efault items are created using int(), which will return the integer object 0. For the second example, default items are created using list(), which returns a new empty list object.
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What killed my process and why?
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answered Apr 7 '09 at 17:23
dwcdwc
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How to validate an email address using a regular expression?
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+50
The fully RFC 822 compliant regex is inefficient and obscure because of its length. Fortunately, RFC 822 was superseded twice and the...
What is “point free” style (in Functional Programming)?
...you specify the arguments explicitly):
sum (x:xs) = x + (sum xs)
sum [] = 0
Point-free (sum doesn't have any explicit arguments - it's just a fold with + starting with 0):
sum = foldr (+) 0
Or even simpler: Instead of g(x) = f(x), you could just write g = f.
So yes: It's closely related to c...
Angularjs if-then-else construction in expression
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Rafael Almeida
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answered May 16 '13 at 11:16
Andre GoncalvesAndr...
Determining complexity for recursive functions (Big O notation)
...O notation, for each function:
int recursiveFun1(int n)
{
if (n <= 0)
return 1;
else
return 1 + recursiveFun1(n-1);
}
This function is being called recursively n times before reaching the base case so its O(n), often called linear.
int recursiveFun2(int n)
{
if (n &...