Passing xtra parameter

9 次查看（过去 30 天）
srycandy
srycandy 2012-2-24
编辑： W. Owen Brimijoin 2013-10-23
i do an example provide in matlab on passing xtra parameter. these are the codes:
function y = parameterfun(x,a,b,c)
a = 4; b = 2.1; c = 4; % Assign parameter values
x0 = [0.5,0.5];
y = (a - b*x(1)^2 + x(1)^4/3)*x(1)^2 + x(1)*x(2) +(-c + c*x(2)^2)*x(2)^2;
f = @(x)parameterfun(x,a,b,c);
[x,fval] = fminunc(f,x0)
end
However, i got an error said that:
??? Input argument "x" is undefined.
Error in ==> parameterfun at 4
y = (a - b*x(1)^2 + x(1)^4/3)*x(1)^2 + x(1)*x(2) +(-c + c*x(2)^2)*x(2)^2;
please help me. I dont know how to fix it. tq

请先登录，再回答此问题。

回答（1 个）

Geoff
Geoff 2012-2-24
That doesn't look right. I am guessing you intended to do the following:
function y = parameterfun(x,a,b,c)
y = (a - b*x(1)^2 + x(1)^4/3)*x(1)^2 + x(1)*x(2) +(-c + c*x(2)^2)*x(2)^2;
end
a = 4; b = 2.1; c = 4; % Assign parameter values
x0 = [0.5,0.5];
f = @(x)parameterfun(x,a,b,c);
[x,fval] = fminunc(f,x0)
  2 个评论
srycandy
srycandy 2012-2-24
I get this error, when i use ur suggestion.
??? Error: File: parameterfun.m Line: 5 Column: 1
This statement is not inside any function.
(It follows the END that terminates the definition of the function
"parameterfun".)
srycandy
srycandy 2012-2-24
i already get the answer... silly me.. starting line 4 to last line , we have to run it at command prompt.. why it has to be like that?

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Logical 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by