Re: Re-sending: Setting a range for variables

[marco atzeri]

On 12/27/2011 7:11 PM, Pedro Castro Menezes Xavier de Mello e Silva wrote:
> Hello there,
>
> I'm trying to solve a system of 5 nonlinear equations with 5 variables
> with octave, but the results are rubbish. I would like to set limits,
> such as "x(1) must be smaller than 0" (x(1) is one of the unknowns) so
> that the solver don't produce x(1) = 2 as an answer, for instance.
>
> Is there a way to do it using fsolve? I'm googling it for more than 2
> hours with no success.
>
> Thanks in advance,
>
> Pedro

try using sqp

www.gnu.org/software/octave/doc/interpreter/Nonlinear-Programming.html

and instead of the root of f(x)=0 look for the minimal of f(x)^2

Regards
Marco