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# I Keep Getting Error "Matrix dimensions must agree"

조회 수: 1(최근 30일)
Alexandra Keith 2019년 12월 11일
마감: MATLAB Answer Bot 2021년 8월 20일
I keep getting error like
Error using .*
Matrix dimensions must agree.
How Can I fix it ? Please help me. Any help given will be much appreciated. Here is the line of code
##### 댓글 수: 1표시숨기기 없음
You can fix it by ensuring the two sides of the multiplication are the same size. It's really that simple! We have no idea what size af is from the code you showed. You can see trivially in your workspace though so if you give all the information it is a lot easier for people to help.

### 답변(1개)

Nicolas B. 2019년 12월 11일
If you are using *, than it is a matrix multiplication and the size of your matrices must be compatible.
If you want to multiply element per element, uses .* .
Examples:
a = [1 2 3];
b = [1 2 3; ...
4 5 6; ...
7 8 9];
c = [9 8 7; ...
6 5 4; ...
3 2 1];
a * b % result -> [30 36 42]
a * c % result -> [30 24 18]
a .* b % result -> [1 4 9
% 4 10 18
% 7 16 26] each value of a multiply all values of the same column in b
b .* c % result -> [ 9 16 21
% 24 25 24
% 21 16 9] multiply element per element
##### 댓글 수: 2표시숨기기 이전 댓글 수: 1
Nicolas B. 2019년 12월 11일
what are the size of lp and af?

R2013a

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