[scilab-Users] Solving multi-variable function
Jerry Wang
jerrwang at yahoo.com
Thu Mar 13 21:03:05 CET 2008
Oh, sorry, somehow the website doesn't like the .sci extension. Please see it here:
http://www.imagingspot.com/scilab/func_for_fsolve.txt
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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