Subtracting Two Matrices of different sizes

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How do I do the following subtraction: let X = [302 64] where all values in X are either 0s or 1s
A= X - X';
A=[302 64] - [64 302];
How do I find subtract these?
  3 Comments
AR
AR on 18 Dec 2015
Walter, Was expecting [302 302]; additionally I'm subtracting [302 64] - [64 140] and would like this to equal [302 140]. Hope this is possible as I'm stuck with many errors in do loop. Thx, Allen
Walter Roberson
Walter Roberson on 18 Dec 2015
For any one entry in the result, say A(J,K), how should A(J,K) be computed?

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Accepted Answer

Walter Roberson
Walter Roberson on 18 Dec 2015
T1 = X; %the left side
T2 = X'; %whatever the right side is
if any(size(T1) < size(T2))
T1(size(T2,1),size(T2,2)) = 0; %zero pad
end
if any(size(T2) < size(T1))
T2(size(T1,1),size(T1,2)) = 0; %zero pad
end
A = T1 - T2;

More Answers (1)

Renato Agurto
Renato Agurto on 18 Dec 2015
Hi
do you mean something like this?
%A,B: inputs matrices
%C output matrix
N = max([size(A,1) size(B,1)]);
M = max([size(A,2) size(B,2)]);
An = zeros(N,M);
Bn = zeros(N,M);
An(1:size(A,1), 1:1:size(A,2)) = A;
Bn(1:size(B,1), 1:1:size(B,2)) = B;
C = An-Bn

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