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Knight's Shortest Path on Chessboard
...alue=1), and unavailable moves are disconnected (value=0), the sparse matrix would be like:
(a1,b3)=1,
(a1,c2)=1,
.....
And the shortest path of two points in a graph can be found using http://en.wikipedia.org/wiki/Dijkstra's_algorithm
Pseudo-code from wikipedia-page:
function Dijkstra(Graph,...
Is it possible to specify your own distance function using scikit-learn K-Means Clustering?
... issparse # $scipy/sparse/csr.py
__date__ = "2011-11-17 Nov denis"
# X sparse, any cdist metric: real app ?
# centres get dense rapidly, metrics in high dim hit distance whiteout
# vs unsupervised / semi-supervised svm
#....................................................................
How do I find the duplicates in a list and create another list with them?
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CSS hack大全 - 创意 - 清泛网 - 专注C/C++及内核技术
...览器测试仪器，测试您现在使用的浏览器类型IE6IE7IE8FirefoxOperaSafari(Chrome)IE6IE7IE8FirefoxOperaSafari(Chrome)您现...part1 —— 浏览器测试仪器，测试您现在使用的浏览器类型
/***************************************** 各游览器兼容CSS ****************...
Wrap a delegate in an IEqualityComparer
...ning a correct hashcode), but I'd like to know if there is an out-of-the-box solution.
13 Answers
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Why does this Java code compile?
...illegal because b is an illegal forward reference to b. You can actually fix this by writing int b = this.b + 1, which compiles without complaints.
For local variables, int d = d + 1 is illegal because d is not initialized before use. This is not the case for fields, which are always default-initia...
if/else in a list comprehension
...
You can totally do that. It's just an ordering issue:
[unicode(x.strip()) if x is not None else '' for x in row]
In general,
[f(x) if condition else g(x) for x in sequence]
And, for list comprehensions with if conditions only,
[f(x) for x in sequence if condition]
Note that this ...
Fastest way to find second (third…) highest/lowest value in vector or column
R offers max and min, but I do not see a really fast way to find another value in the order, apart from sorting the whole vector and then picking a value x from this vector.
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Replacing NAs with latest non-NA value
...ke to "fill forward" NAs with the closest previous non-NA value. A simple example, using vectors (instead of a data.frame ) is the following:
...
Why doesn't Python have a sign function?
...ed behavior for edge cases - which sometimes might require the call to cmp(x,0).
I don't know why it's not a built-in, but I have some thoughts.
copysign(x,y):
Return x with the sign of y.
Most importantly, copysign is a superset of sign! Calling copysign with x=1 is the same as a sign functi...