Re: Trouble with fsolve

[David Bateman]

Adam C Powell IV wrote:

> Greetings,
>
> I'm trying to solve a system with a function of more than one parameter:
>
> [x,fval] = fsolve(@hello_calc,x_guess,options,z3,Param);
>
> where hello_calc is declared later in the same file:
>
> function [fval]=hello_calc(x,z3,Param)
>
> This works just fine in MATLAB, but in octave I get:
>
> error: evaluating for command near line 40, column 1
> error: called from `hello' in file `hello.m'
>
> Can octave fsolve not deal with functions of more than one parameter?
> That seems to be suggested by the "man page" for fsolve which comes up
> after the error is displayed...
>
> Thanks,
> -Adam
>  

The syntax with function handles is not supported in the CVS. I wrote a 
patch to support it which was a huge hack, which you can find at

http://www.octave.org/mailing-lists/octave-maintainers/2004/627

together with the explanation of why this is the wrong way to go.. Note 
that the changes to "quad" were made. However daspk, dasrt, dassl, 
fsolve, lsode and odessa weren't converted as the resulting code is an 
ugly hack. The only real solution is to completely dump the existing 
mess for these functions and reimplement it removing the underlying 
fortran code.... So a workaround with global variables is the only way 
this can be done at the moment in octave..

D.

--
David Bateman                                address@hidden
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