[bug #68035] [Statistics] pdist2 memory requirement and speed

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Follow-up Comment #1, bug #68035 (group octave):

The same idea but a (somewhat) different implementation.
(file pdist2_das.m) 


octave:1> pkg load statistics
octave:2> test pdist2 
PASSES 33 out of 33 tests
octave:3> A = rand(4754,1024);
octave:4> B = rand(6800,1024);
octave:5> tic; D = pdist2(A,B,'euclidean'); toc 
Elapsed time is 0.587731 seconds.
octave:6> tic; D = pdist2(A,B,'squaredeuclidean'); toc 
Elapsed time is 0.300159 seconds.


It does return slightly different numbers than original pdist2
(due to Blas usage and different OP order) so it breaks a couple statistics
tests due to precision.

Dmitri.
-- 



(file #58231)

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