Re: Random access loops performing slowly

[David Bateman]

Bhaskar Mehta wrote:
> As a followup, the matrix I mention is at
> http://www.l3s.de/~mehta/sorted_movielens_144_test_users.txt
>
> The  simple bmmread script reads the matrix market sparse format for
> octave/matlab (see end of email for code). I run octave 2.9.14
>
> Would someone be willing to try my code on octave 2.9.15 and see if the
> problem has been fixed ?
> Best regards,
> Bhaskar 
>
> function out=bmmread(k)
>
> Y=load(k);
> out=spconvert(Y(2:end,:));
>   
For Octave 2.9.15 I get

T =  17.328
T =  96.160

On the same machine with Matlab2007a I get

T =    2.3750
T =    6.0512

So yes there is about a factor of 10 difference. However, I suspect this
is due to the JIT in matlab give the form of the code... Writing the two
line for-loop as an oct-file and I suspect this will be much much faster..



D.

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