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

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Follow-up Comment #6, bug #68035 (group octave):

This is type of numbers I got few days ago.  I just re-run to provide you the
numbers on my end as a reference. Thanks.  

A = rand(4754,1024); B = rand(6800,1024);tic; D = pdist2_das(A,B,'euclidean');
toc
A = rand(4754,1024); B = rand(6800,1024);tic; DD = sqrt(
bsxfun(@plus,sum(A.^2,2),sum(B.^2,2)') - 2*(A*B') ); toc 

Elapsed time is 0.875201 seconds.
Elapsed time is 0.830285 seconds.


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