Error: Inner matrix dimensions must agree.

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Chien-Chia Huang 2011-6-15

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https://ww2.mathworks.cn/matlabcentral/answers/9545-error-inner-matrix-dimensions-must-agree

Hi, I am using "gamultiobj" to solve my problem. I, however, have no idea why the error message occurred

??? Error using ==> mtimes
Inner matrix dimensions must agree.
Error in ==> col_mop>@(x)x'*(B'*B)*x at 50
fun1 = @(x) x'*(B'*B)*x;

My objective function is coded as follows

fun1 = @(x) x'*(B'*B)*x;
fun2 = @(x) x'*x;
bifun = @(x) [fun1(x) fun2(x)];

The dimension of B'*B is m so x is an m-by-1 vector. The syntax for gamultiobj is

X = gamultiobj(FITNESSFCN,NVARS,A,b,Aeq,beq,LB,UB,options)

I have properly input the number of decision variables (NVARS) as m but the error message shows. I also check the dimensions using the command "whos" which showed what I wanted. Is there anything wrong?

Thanks in advance.

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采纳的回答

Paulo Silva 2011-6-15

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https://ww2.mathworks.cn/matlabcentral/answers/9545-error-inner-matrix-dimensions-must-agree#answer_13120

Error correction...inner matrix dimensions must be same??? how to correct ?

(look at Matt Fig answer on that question)

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Chien-Chia Huang 2011-6-15

Thanks a lot, Paulo! I just found out what the problem is. The x in gamultiobj is by default supposed to be a row vector, but I thought intuitively of x as a column vector. The problem was just solved.

Chien-Chia Huang 2011-6-16

sorry Matt I did not see your reply. The output of size(B) was 5-by-10 and size(x) was 10-by-1. But the requested x in gamultiobj should be 1-by-10. Thanks, anyway. :D

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