From help-request at octave dot org Wed Aug 11 09:20:35 2004
Subject: Performance of subsasgn and subsref
From: <jiaguo at uiuc dot edu>
To: help at octave dot org
Date: Wed, 11 Aug 2004 09:15:57 -0500

Hi 

I did very simple experiments in both matlab and octave. 
In octave:
octave:1>  m = rand(3000);
octave:2> tic, a=m(1:2999, 1:2999); toc
ans = 2.2935

octave:4> tic,m(2:3000, 2:3000)=a; toc
ans = 1.8978

-----------
In matlab
>> m=rand(3000);
>> tic, a=m(1:2999, 1:2999); toc

elapsed_time =

    0.5277

>> tic,m(2:3000, 2:3000)=a; toc

elapsed_time =

    0.4800


I was wondering what causes the difference in performance. 
I am using octave 2.1.57

Thanks,
Jia



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