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I want element (3,2) from a matrix with size (4,4) to try the values of the first column from another matrix with size (3,3) one by one and at each time produce the new matrix. How can I do this ?

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For example: If I have matrix A and Matrix B:
A =
7 4 1
4 5 6
3 6 9
B =
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
I want element (3,2) from matrix B with size (4,4) to try the values of the first column from matrix A with size (3,3) one by one and at each time produce the new matrix. So, the output will be:
B =
0 0 0 0
0 0 7 0
0 0 0 0
0 0 0 0
B =
0 0 0 0
0 0 4 0
0 0 0 0
0 0 0 0
B =
0 0 0 0
0 0 3 0
0 0 0 0
0 0 0 0
How can I do this ?

Answers (1)

Geoff Hayes
Geoff Hayes on 9 May 2017
Mahmoud - do you want to keep the updated B at each iteration, or just use it and then dispose of it?
for k=1:size(A,1)
B = zeros(4,4);
B(2,3) = A(k,1);
% do something with B
end
In the above, we iterate over each row in the first column of A and set the appropriate element of B with it.
Note how we use B(2,3) to access the element in the second row and third column of B (rather than the B(3,2) that you mention).
  2 Comments
Geoff Hayes
Geoff Hayes on 10 May 2017
Which value in the second column of A? You should be able to modify the above so that you can accomplish that task.

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