lsqnonlin reports it cannot accept function handle inputs
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I have a short script to optimize a four-coefficient nonlinear equation. When I run the script, lsqnonlin reports an error that seems to fly in the face of the direct MATLAB help file about how to run lsqnonlin.
A=5.5;
B=0;
C=1;
p=2;
TM=1;
x0=[A,B,C,p];
%coefficients of the function.
options = optimset('MaxFunEvals',10000,'MaxIter',10000,'TolFun',1e-12,'TolX',1e-12);
x=lsqnonlin(@Error_Curve,x0,[0 0 -1000 0],[1000 1000 1 100],options,I,t);% Calculate the new coefficients using LSQNONLIN.
The vectors I and t are defined previously in the file, but they're long and pointless to include here. Also, my function is defined as follows:
function F = Error_Curve(x,X,Y)
A = x(1); B = x(2); C = x(3); p = x(4);
tt = A./((X./IM).^p-C)+B;
F = (log10(tt)-log10(Y)).^2;
end
When the script gets down to run lsqnonlin, I get the following error:
Undefined function 'lsqnonlin' for input arguments of type 'function_handle'.
Error in CurveFitting_Fuses (line 79)
x=lsqnonlin(@Error_Curve,x0,[0 0 -1000 0],[1000 1000 1 100],options,I,t)
I'd expect this if I didn't have the toolbox installed. But I DO have the toolbox installed (version 7.0 with Matlab R2014a).
>> exist('lsqnonlin')
ans =
2
I also receive the help information when I ask for it
>> help lsqnonlin
lsqnonlin solves non-linear least squares problems.
lsqnonlin attempts to solve problems of the form:
min sum {FUN(X).^2} where X and the values returned by FUN can be
X vectors or matrices.
This tells me that I have the function. So, I copied the example from the tutorial in the help documentation, but I get the same result.
% SCRIPT optimizer_tutorial.m
x0 = [0.3 0.4] % Starting guess
[x,resnorm] = lsqnonlin(@myfun,x0); % Invoke optimizer
function F = myfun(x)
k = 1:10;
F = 2 + 2*k-exp(k*x(1))-exp(k*x(2));
end
>> optimizer_tutorial
x0 =
0.3000 0.4000
Undefined function 'lsqnonlin' for input arguments of type 'function_handle'.
Error in optimizer_tutorial (line 2)
[x,resnorm] = lsqnonlin(@myfun,x0); % Invoke optimizer
Why doesn't this function work correctly? Do I have the wrong version of Matlab or something?
采纳的回答
DanD
2016-9-30
1 个评论
Star Strider
2016-9-30
Thank you!
I’ve never seen that before. I added using which to check for network licensing to my notes on this problem.
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