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# Compare matrices from different programs

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fiona rozario on 21 Feb 2017
Closed: MATLAB Answer Bot on 20 Aug 2021
I have two matrices created from two different programs. Matrix A from program A and matrix B from program B. The matrix sizes are same and I want to compare the elements of these matrices. Is that possible? If yes, how?

Jan on 21 Feb 2017
If the matrices are small, you can subtract them:
A - B
abs(A- B)
If they are too large to keep the overview in the command window:
D = abs(A - B);
max(D(:))
min(D(:));
You can draw the difference:
Img = A - B;
Img = Img - min(Img(:));
Img = Img / max(Img(:)); % Normalize to [0, 1]
image(Img);
If you only want to check, if the matrices are equal:
isequal(A, B)
Rik on 21 Feb 2017
Well, this is what you get from not being clear on how you precisely want to compare the matrices ;)
Jan on 22 Feb 2017
@Rik: And the detail that the matrices are comming from "two different programs" has not been considered. I hope that fiona gets inspirated by our suggestions.

Rik on 21 Feb 2017
A = [3 4;8 9];
B = [3 6;0 4];
AreElementsEqual = A==B ;