Zscore a matrix with NaN
조회 수: 134 (최근 30일)
이전 댓글 표시
I have matrix A, and I need to find a zscore value (with the intention of running a PCA) of a matrix that has NaN values. I need to have matlab ignore the NaNs while solving for the zscore value. How can I do this? I tried Zscore = zscore(~isnan(A)) but it didn't work.
Thanks for your help!
댓글 수: 0
채택된 답변
Star Strider
2015년 10월 19일
편집: Star Strider
2015년 10월 19일
You can create your own function to compute the Z-scores omitting NaN values (I believe the 'omitnan' option began in R2014b). The result vector retains the NaN values while it computes the Z-score without them:
zscor_xnan = @(x) bsxfun(@rdivide, bsxfun(@minus, x, mean(x,'omitnan')), std(x, 'omitnan'));
q = rand(10,2);
q([3 5 7],1) = NaN;
Zscore = zscor_xnan(q);
댓글 수: 1
Patrick
2016년 7월 22일
편집: Patrick
2016년 7월 22일
can you perhaps elaborate a little bit. I'm new but here's what I had for the function (using MatLab 2015)
function zcor_xnan = @(x) bsxfun(@rdivide, bsxfun(@minus, x, mean(x,'omitnan')), std(x, 'omitnan'));
end
Here is what I have in my script
if true
% code
q = rand(10,2);
q([3 5 7],1) = NaN;
Zscore = zscor_xnan(q);
end
Really sorry I know this is a very infantile question but I rarely use functions.
추가 답변 (1개)
참고 항목
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!