whats the meaning of these question? " Subscripted assignment dimension mismatch."

in an optimization problem i encounter with this message . whats the problem and how can i solve it?

[John D'Errico]

Learn to use the debugger.

[Jan]

[MOVED from flags] André Duarte wrote:

 rude answer

[Jan]

@André Duarte: No, this comment is not rude. It does not contain any offenses or personal opinions. It is essential to learn how to use the debugger. The question did not contain enough information to be answered and the debugger will help to find out, what the problem is. Type this in the command window (or use the corresponding menu in the editor)

dbstop if error

Then run the code again. When Matlab stops at the error, check the used indices. In other words: Learn to use the debugger. It is the best friend of the programmer - even better than this forum.

[Walter Roberson]

Renzo Lanfranco also commented

Rude answer

[Walter Roberson]

Renzo Lanfranco:

The response was not rude. It was correct: the way to solve the problem is to learn how to use the debugger.

Answer 1

[AJ von Alt]

This error occurs when the dimensions of the array resulting from the assignment expression do not match the explicitly defined dimensions of the assignment variable.

Basically, the dimensions of the arrays on the left and right hand side of the equals sign don't match.

The code

    A(1,1) = [1 2 3; 4 5 6; 7 8 9]; %you can't store a 3x3 matrix in a 1x1 matrix

produces the error

    Subscripted assignment dimension mismatch.

because A(1,1) is size 1x1 and [1 2 3; 4 5 6; 7 8 9]; is size 3x3.

You can solve this error by making sure that the dimensions match.

    A(1:3,1:3) = [1 2 3; 4 5 6; 7 8 9]; % Doesn't error because both arrays are 3x3