Re: [OctDev] argument checking in minimization functions

[Michael C. <mic...@ua...>]

Hi again,
All 3 algorithms, bfgsmin, lbfgsmin and samin are written so that the 
parameter with respect to which minimization is done should be a column 
vector. Unfortunately, I don't seem to have explicitly stated that 
anywhere.... Also, type checking doesn't currently go that far. I'll take 
care of it tomorrow. Thanks again - hopefully it'll eventually get harder for 
you to find these :-)

M.


On Tuesday 07 September 2004 13:57, Teemu Ikonen wrote:
> On 07/09/04 11:56, Michael Creel wrote:
> > Forget it please. As is predictable, the error is mine. The CVS versions
> > will be fixed in 10 minutes or so. Thanks for the bug reports, Teemu.
>
> Here's another one. This is with CVS version with your latest fixes:
>
> function chi2=chigl(a, x, y)
>
>   f = a(1).*x.^2 + a(2);
>   chi2 = sum( (y - f).^2);
>
> endfunction
>
> > x = linspace(-5, 5, 10);
> > y = -1.0 .* x.^2;
> > a = zeros(1,2);
> > [aopt, chi2min] = bfgsmin("chigl", {a, x, y, y}, {10,2,1,1});
>
> error: invalid conversion from matrix to real column vector
> octave: /usr/local/include/octave-2.1.58/octave/dim-vector.h:104: int&
> dim_vector::dim_vector_rep::elem(int): Assertion i >= 0 && i < ndims'
> failed. panic: Aborted -- stopping myself...
> attempting to save variables to octave-core'...
> save to octave-core' complete
> Aborted
>
> When the first argument is a column vector, there's no crash.
>
> Teemu
>
>
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