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fminsearch error regarding matrix dimensions

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MiauMiau
MiauMiau 2014-7-3
评论： MiauMiau 2014-7-3
Hi
I am using fminsearch to minimize the following function:
a_d = 13.2414;
a_nd = 15.5107;
b_d = -1.4207;
b_nd = -1.9339;
Ft = 35;
funct = @(x)a_d*((2*Ft)/(x+1))+b_d+(a_nd*x*((2*Ft)/(x+1)))+b_nd;
[x,fval] = fminsearch(funct, [0, 10]);
But do get the following error:
Error using /
Matrix dimensions must agree.
Error in @(x)a_d*((2*Ft)/(x+1))+b_d+(a_nd*x*((2*Ft)/(x+1)))+b_nd
Error in fminsearch (line 191)
fv(:,1) = funfcn(x,varargin{:});
Error in Script (line 22)
[x,fval] = fminsearch(funct, [0, 10]);
What is the problem? Thanks!

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Mischa Kim
Mischa Kim 2014-7-3
编辑：Mischa Kim 2014-7-3
MiauMiau, the function funct has only one dependent variable, x, correct? If so this needs to be reflected in the function call for fminsearch
[x,fval] = fminsearch(funct, 0);
With your function call
[x,fval] = fminsearch(funct, [0, 10]);
you assign starting values for a 2-vector, e.g. x1 and x2.
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