[scilab-Users] Solving multi-variable function

[Eric Dubois]

I cannot run your function because you do not provide the function
ABSPredictor. But, if your function func_for_fsolve.sci is exactly what is
on your website, there are some oddities. In particular, you should not
define x0 inside the function to maximise, but outside.

Eric.

2008/3/13, Jerry Wang <jerrwang at yahoo.com>:
>
> Oh, sorry, somehow the website doesn't like the .sci extension.  Please
> see it here:
>
> *http://www.imagingspot.com/scilab/func_for_fsolve.txt*<http://www.imagingspot.com/scilab/>
>
> Yes, I provided initial values to the 4 variables.  The "caller"
> function has:
>
> chdir('C:\MyScilab');
> getf('ABSPredictor.sci')
> getf('func_for_fsolve.sci');
> tic();
> ret_age=60;
> mu_tree=36000;
> delta_t=0.85;
> sigma_b=0.50;
> [x_result,v,info]=fsolve([ret_age, mu_tree, delta_t,
> sigma_b],func_for_fsolve);
> time_length=toc()
> beep();
>
> When debugging, the func_for_fsolve does fine for the first iteration.
> Then it gives that error at the end of the first iteration.
>
> Jerry
>
>
> ----- Original Message ----
> From: Eric Dubois <grocer.toolbox at gmail.com>
> To: users at lists.scilab.org
> Sent: Thursday, March 13, 2008 12:46:42 PM
> Subject: Re: [scilab-Users] Solving multi-variable function
>
> Unfortunately, the function is not available at the provided address...
>
> Did you provide values to ret_age, mu_tree, delta_t, sigma_b, in order to
> feed the optimization program?
>
> Eric.
>
>
> 2008/3/13, Jerry Wang <jerrwang at yahoo.com>:
> >
> >  I did attempt to collapse the 4 variables into a single vector array
> > but I received an error after fsolve reaches the end of the first
> > iteration.  The error is:
> >
> > !--error 98
> >  variable returned by scilab argument function is incorrect
> >
> >  --------------------------------------
> > I add the function into the scope via:
> > --------------------------------------
> >     getf('func_for_fsolve.sci');
> >
> >  --------------------------------------
> > I call the function via:
> >  --------------------------------------
> >     [x_result,v,info]=fsolve([ret_age, mu_tree, delta_t,
> > sigma_b],func_for_fsolve);
> >
> >  --------------------------------------
> > Inside func_for_solve I have:
> >  --------------------------------------
> > function [y] = func_for_fsolve ( x0 )
> > ...
> > ret_age = round(x0(1));
> > mu_tree = x0(2);
> > delta_t = x0(3);
> > sigma_b = x0(4);
> > ...
> > [statistical_sustainable] =
> > ABSPredictor(mc,now_age,ret_age,mu_tree,delta_t,sigma_b);
> > ...
> > y = abs(statistical_sustainable(index)./100 - 0.90);
> > ...
> > y = y + penalties;
> > disp('testing123');
> > disp('testing234');
> > endfunction
> >
> > --------------------------------------
> > --------------------------------------
> >
> > I tried testing the code by reducing the supplied argument x0 into 1
> > scalar variable instead of the 4 scalar vector, and the function call
> > worked.  That's why I went ahead and assumed that fsolve takes only one
> > variables.  Can you see what I am doing wrong that's causing me to receive:
> >  !--error 98
> >  variable returned by scilab argument function is incorrect
> >
> >
> > Thank you!
> >
> > Jerry
> >
> > ps. the complete func_for_fsolve.sci is uploaded here for your viewing:
> > http://www.imagingspot.com/scilab/func_for_fsolve.sci
> >
> >
> >
> >
> > ----- Original Message ----
> > From: Eric Dubois <grocer.toolbox at gmail.com>
> > To: users at lists.scilab.org
> > Sent: Thursday, March 13, 2008 5:41:21 AM
> > Subject: Re: [scilab-Users] Solving multi-variable function
> >
> > Fsolve takes one variable input, but the input can be a vector of any
> > size.
> >
> > So, collapse your 4 variables into a single vector and adapt your
> > fonction accordingly.
> >
> > Eric.
> >
> >
> > 2008/3/13, Jerry Wang <jerrwang at yahoo.com>:
> > >
> > >  Hello Scilab-ers,
> > >
> > > Can any one point me to the right direction?  I want to find the zero
> > > point of a function that has 4 variables.  I want scilab to solve for the
> > > values of the 4 variables that would give me a result = 0 for the answer.  I
> > > initially tried fsolve, but I discovered that fsolve only take one variable
> > > input.
> > >
> > > Any thoughts?  Thanks!
> > >
> > > Jerry
> > >
> > > ------------------------------
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> > > it now.<http://us.rd.yahoo.com/evt=51733/*http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ>
> > >
> >
> >
> >
> > ------------------------------
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> >
>
>
>
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