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

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