[scilab-Users] Report of potential problems with the nelder-mead series of functions

[Michaël Baudin]

Hi,

I agree on both points : I will commit a bug fix in branch 5.2 tomorrow.

Best regards,

Michaël

Sébastien Bihorel a écrit :
> Hi,
>
> I was reading through the code of the fminsearch function and its 
> wealth of related functions, and was wondering if there could be a 
> problem with the optimsimplex.axes function. At this point, I honestly 
> don't know what it is doing but I think there might be something wrong 
> with the code:
> 1- xlen1 is defined but never used. The check that is directly 
> following its definition is probably supposed to use it but doesn't
>     xlen1 = size(len,1)
>     if size(x0,1)<>1 then
>       errmsg = msprintf(gettext("%s: The len vector is expected to be 
> a row matrix, but current shape is %d x 
> %d"),"optimsimplex_axes",size(len,1),size(len,2));
>       error(errmsg);
>     end
>
> 2- nothing seems to prevent this call to crash, the dimensions of xlen 
> and the matrix newobj.x(,) are not cross-checked
>   newobj.x ( 2:nv , : ) = newobj.x ( 2:nv , : ) + diag(xlen);
>
> HIH
>
> Sebastien


-- 
Michaël Baudin
Ingénieur de développement
michael.baudin at scilab.org
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