Adding to the first value in a matrix based on the second value in that row.

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I have a matrix which has 4 columns and a number of rows. I simply want to add 1 to the value in the first column of a row if the second column has the value of 11 or 12 in it.

Accepted Answer

Alex Mcaulley
Alex Mcaulley on 7 Jan 2020
Being A your matrix:
A(A(:,2) == 11 | A(:,2) == 12,1) = A(A(:,2) == 11 | A(:,2) == 12,1) + 1

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