Function Error not understood

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Shalini 2012-3-8

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/31611-function-error-not-understood

I wrote the following function:

function diff = fit_simp(x,X,Y)
% This function is called by lsqnonlin.
% x is a vector which contains the coefficients of the
% equation.  X and Y are the option data sets that were
% passed to lsqnonlin.
A=x(1);
B=x(2);
n=x(3);
diff = (A+B*(X^n)) - Y;
end

Then the following script;

>> X=xlsread('QS2T.xls',9,'V638:V1835');
>> Y=xlsread('QS2T.xls',9,'W638:W1835');
>> X0=[800 1537 0.1448];
>> options = optimset('Largescale','off');
>> x=lsqnonlin(@fit_simp,X0,[],[],options,X,Y);

I get the error below, don't know what is wrong. All this was given in matlab examples in the website.PLs help, *|??? Error using ==> mpower Matrix must be square.

Error in ==> fit_simp at 12 diff = (A+B*(X^n)) - Y;

Error in ==> lsqnonlin at 202 initVals.F = feval(funfcn{3},xCurrent,varargin{:});

Caused by: Failure in initial user-supplied objective function evaluation. LSQNONLIN cannot continue.|*