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PHP Sort Array By SubArray Value
... answered Mar 19 '10 at 13:14
kennytmkennytm
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Reverse colormap in matplotlib
I would like to know how to simply reverse the color order of a given colormap in order to use it with plot_surface.
7 Answ...
how to return index of a sorted list? [duplicate]
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You can use the python sorting functions' key parameter to sort the index array instead.
>>> s = [2, 3, 1, 4, 5]
>>> sorted(range(len(s)), key=lambda k: s[k])
[2, 0, 1, 3, 4]
>>>
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std::next_permutation Implementation Explanation
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Let's look at some permutations:
1 2 3 4
1 2 4 3
1 3 2 4
1 3 4 2
1 4 2 3
1 4 3 2
2 1 3 4
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How do we go from one permutation to the next? Firstly, let's look at things a little differently. We can view the elements as digits and ...
Best way to find if an item is in a JavaScript array? [duplicate]
...rr,obj) {
return (arr.indexOf(obj) != -1);
}
EDIT:
This will not work on IE6, 7 or 8 though. The best workaround is to define it yourself if it's not present:
Mozilla's (ECMA-262) version:
if (!Array.prototype.indexOf)
{
Array.prototype.indexOf = function(searchElement /*, from...
What are bitwise operators?
...y delved into it in either an academic or professional setting, so stuff like these bitwise operators really escapes me.
9 ...
Rolling median algorithm in C
I am currently working on an algorithm to implement a rolling median filter (analogous to a rolling mean filter) in C. From my search of the literature, there appear to be two reasonably efficient ways to do it. The first is to sort the initial window of values, then perform a binary search to inser...
What is tail recursion?
...to complete before the JavaScript interpreter begins to actually do the work of calculating the sum.
Here's a tail-recursive version of the same function:
function tailrecsum(x, running_total = 0) {
if (x === 0) {
return running_total;
} else {
return tailrecsum(x - 1, runn...
In SQL, how can you “group by” in ranges?
... edited Jul 16 at 21:43
Dale K
11.1k88 gold badges3232 silver badges5959 bronze badges
answered Oct 24 '08 at 12:01
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TCP: can two different sockets share a port?
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A server socket listens on a single port. All established client connections on that server are associated with that same listening port on the server side of the connection. An established connection is uniquely identified by the comb...