Function Error not understood
조회 수: 1 (최근 30일)
이전 댓글 표시
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.|*
댓글 수: 0
채택된 답변
Honglei Chen
2012년 3월 8일
You may want to use X.^n to achieve element-wise operation
댓글 수: 7
Honglei Chen
2012년 3월 8일
this might suggest that the function didn't converge but I'm not sure what's wrong. You may need to examine your data.
추가 답변 (0개)
참고 항목
카테고리
Help Center 및 File Exchange에서 Matrix Indexing에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!