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Re: simple vector to matrix transformation

From: Mike Miller
Subject: Re: simple vector to matrix transformation
Date: Tue, 22 Jun 1999 15:56:58 -0500 (CDT)

My earlier timing computations were not totally satisfactory, so here are
some more reliable answers:

octave:1> t0=cputime; for i=1:100, b=a*ones(1,1000); end, (cputime-t0)/100
ans = 0.10460
octave:2> t0=cputime; for i=1:100, b=a(:,ones(1,1000)); end, (cputime-t0)/100
ans = 0.36300
octave:3> t0=cputime; for i=1:100, b=a(1:1000,ones(1,1000)); end, 
ans = 0.39550

Those answers are essentially means of 100 cputimes.  As you can see, the
answers are practically the same as the ones I presented originally.



Michael B. Miller
University of Missouri--Columbia

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