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Replacing elements in matrix columns

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Fayyaz
Fayyaz 2015-4-14
回答： Chris McComb 2015-4-14
Hi,
I have a matrix 61312*3, and I want to replace the element of the 2nd and 3rd column by some numbers. For example, in 2nd and 3rd column, I need to replace
34 by 1
10, 17, 22, 39, and 59 by 2
and so on.
How should I proceed? Thanks in advance.

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回答（1 个）

Chris McComb
Chris McComb 2015-4-14
You can do the replacement using logical indexing. The replacement for 34 --> 1 would be as follows:
for i=2:3
idx = (mat(:,i) == 34);
mat(idx,i) = 1;
end

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