Re: Random timing results with 'fsolve'

[Martin Helm]

Am Mittwoch, den 12.10.2011, 15:41 +0200 schrieb Søren Hauberg: 
> Hi All
> 
> I am currently using 'fsolve' to solve a non-linear set of equations,
> for which it works great. However, when I try to determine the running
> time of the algorithm I get rather different results. I tried
> 
>   for idx = 1:10
>     tic, [a1, b1] = fsolve (g, x, struct ("Jacobian", "off")); tid (idx)
> = toc;
>   endfor
> 
> i.e. run the solver ten times with the same input and store running
> times. After this I see
> 
>   octave:313> max (tid_off) / min (tid_off)
>   ans =  4.2706
> 
> Does anybody know why I see so large differences in the timing results?
> 
> Søren
> 
You check the "real" time it takes, if something runs in the background
this will interfere with your time measurement.

Do you get the same randomness when you are using cputime instead?