# Mathematical functions across variables

3 views (last 30 days)
Meredith Ziliak on 18 Sep 2023
Commented: Stephen23 on 19 Sep 2023
I have two variables saved in the workspace, A and B. Say A is 3x3 and B is 2x2. This seems so simple, but how would I add A(1,1) to B(2,1)? I can't seem to get anything to work. Thanks.
Stephen23 on 19 Sep 2023
"This seems so simple, but how would I add A(1,1) to B(2,1)? I can't seem to get anything to work"

John D'Errico on 18 Sep 2023
Edited: John D'Errico on 18 Sep 2023
Is there a good reason why you would not just try this?
A(1,1) + B(2,1)
I think you are coming from a spreadsheet world. And for some reason you think MATLAB needs to operate just like a spreadsheet. Honestly, I don't know what it is you would have tried to do that operation. But I will guess you were trying to click on those elements somehow, and get an addition.

the cyclist on 18 Sep 2023
Edited: the cyclist on 18 Sep 2023
If you just want to know their sum
A(1,1) + B(2,1)
If you want to add A(1,1) to the value stored in B(2,1)
B(2,1) = A(1,1) + B(2,1)
Given the level of your question, you would probably find the free MATLAB Onramp tutorial useful.

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