Why i get : Matrix dimensions must agree? What is meant by this error?

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sam CP 2017-4-4

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https://ww2.mathworks.cn/matlabcentral/answers/333498-why-i-get-matrix-dimensions-must-agree-what-is-meant-by-this-error

关闭： MATLAB Answer Bot 2021-8-20

Untitled2.m

Why i get the following error

Error using .* Matrix dimensions must agree.

Error in Untitled2 (line 41)

ccc1=sum(sum(u1.*u1.*IM))/sum(sum(u1.*u1));

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Stephen23 2017-4-4

编辑：Stephen23 2017-4-4

When I search this forum for "dimensions do not agree" I get 966 results:

https://www.mathworks.com/matlabcentral/answers/?term=dimensions+do+not+agree

Did you look at any of them? This is a very common error that has been explained a thousand times before, and finding information on it is very easy: the top-right of this page has a big white field labeled "Search Answers". It is free for you to use.

请先登录，再回答此问题。

Answer 1

KSSV 2017-4-4

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https://ww2.mathworks.cn/matlabcentral/answers/333498-why-i-get-matrix-dimensions-must-agree-what-is-meant-by-this-error#answer_261642

Untitled.m

You see in line number 41, the matrices which you are multiplying are not of same dimensions. You have to get them to similar dimension using imresize. Check the attached file, whether it gives expected result.