Replacing values in a matrix based on values in another matrix

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Filip Hansson 2022-8-15

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评论： Filip Hansson 2022-8-15

If I have a matrix with "1"s and "0"s (A) and other matrixes of the same size with other values (B,C,D, etc), is it possible to find the locations of the "1"s in A in B,C,D,etc and replace these values with a constant number while the other values in B,C,D, etc are uneffected?

Thanks in advanced!

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Answer 1

Cris LaPierre 2022-8-15

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Use logical indexing (see Ch 11 of MATLAB Onramp)

A = [0 1 1 0]
A = 1×4
     0     1     1     0
B = rand(size(A))
B = 1×4
    0.1915    0.9248    0.8352    0.2674
B(A==1) = 99
B = 1×4
    0.1915   99.0000   99.0000    0.2674