algorithms.utils.fast_distance¶
Module: algorithms.utils.fast_distance
¶
this module contains a function to perform fast distance computation on arrays
Author : Bertrand Thirion, 2008-2011
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nipy.algorithms.utils.fast_distance.
euclidean_distance
(X, Y=None)¶ Considering the rows of X (and Y=X) as vectors, compute the distance matrix between each pair of vectors
Parameters: X, array of shape (n1,p) :
Y=None, array of shape (n2,p) :
if Y==None, then Y=X is used instead
Returns: ED, array fo shape(n1, n2) with all the pairwise distance :