Changing value when first time a value appears
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A=[1; 1; 1; 1; 2; 2; 4; 4; 4; 4]
B=[4; 2; 7; 9; 5; 0; 2; 6; 1; 0]
I want to change the values of B to NaN whenever a value in A appears for the first time. i.e.
B=[NaN; 2; 7; 9; NaN; 0; NaN; 6; 1; 0]
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Accepted Answer
Walter Roberson
on 14 Jan 2021
A=[1; 1; 1; 1; 2; 2; 4; 4; 4; 4]
B=[4; 2; 7; 9; 5; 0; 2; 6; 1; 0]
[~, ia] = unique(A, 'stable')
B(ia) = nan
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