Setting non-repeated elements from two related matrices to NaN

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Victor Francisco Pajuelo Madrigal
评论： Victor Francisco Pajuelo Madrigal 2015-9-12
For the matrices A and B,
A = [1 2 1; 3 5 1; 2 3 6]
B = [1 2 3; 4 5 6; 7 8 9]
set the non-repeated elements of A to NaN, setting also to NaN the related elements of B. By non-repeated elements I refer to elements that only occur once through the whole matrix. Generate the two new matrices from those:
A_nan = [1 2 1; 3 NaN 1; 2 3 NaN]
B_nan = [1 2 3; 4 NaN 6; 7 8 NaN]
Thank so much in advance, just trying to manipulate the matrix before a Regression between A and B.

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the cyclist
the cyclist 2015-9-12
A = [1 2 1; 3 5 1; 2 3 6];
B = [1 2 3; 4 5 6; 7 8 9];
uniqueA = unique(A);
counts = histcounts(A,[uniqueA;Inf]);
nanIndex = ismember(A,uniqueA(counts==1));
A(nanIndex) = NaN;
B(nanIndex) = NaN;
  1 个评论
Victor Francisco Pajuelo Madrigal
Victor Francisco Pajuelo Madrigal 2015-9-12
Thank you very much, this is precisely what I was looking for! Clear and beautiful code, helps me to speed up the learning process. Thanks!

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