Hello!
I seem to have a problem with least-square method. I would estimate that the error is simple but I must admit I am code blind at this moment. The file is displayed below and the error directly after. I have marked the rows in the .m-file which is displayed in the error message with >>>.
function[A Deltapar] = MKA(x,y,deltay,n) A = []; Deltapar = []; X=[];
%———————————————————————————————–% checking if the input for the matrix size is correct >>>if(size(x)(2)~=1) x=x'; end if(size(y)(2)~=1) y=y'; end if(size(deltay)(2)~=1) deltay=deltay'; end %———————————————————————————————– % checking if the matrix x,y, and deltay has the correct size and after that, execute least square method.
if(size(x)(2)==1 && size(y)(2) ==1 && size(deltay)(2)==1)
%———————————————————————————————– % Conducting weighted least squares fit on the matrices x and y have the same format. % If not, a message is returned back an x and y are not of the same length. if(length(x)==length(y)) for i=0:n X=[X x.^i]; end sigma=deltay; vminus1 = diag(1./sigma.^2); A = inv(X' * vminus1 * X) * (X' * vminus1 * y); DeltaA = inv(X' * vminus1 * X); Deltapar = sqrt(diag(DeltaA)); else disp('x,y does not have the same length'); end %———————————————————————————————– % prints out "you have not written the input on correct form"
else disp('you have not written the input on correct form'); end
??? Error: File: MKA.m Line: 17 Column: 4 ()-indexing must appear last in an index expression.
except this problem I seem to have difficulties with calling this file from another .m-file having code shown in the error message.
the error message is as follow: Error in ==> absnoll2 at 80 [a]= MKA(x,y,deltay,1);
Thanks in advance! sorry for the typo..
Friendly Regards, Erik.
Best Answer