How can I skip zero values in an array when evaluating the correlation coefficient ?
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Hello, I am kind of new to Matlab and I am running into some issues evaluating the correlation coefficient between the natural logarithm of two arrays(chan1 and chan2) each of size 577*1 that includes zero values that I would like to skip when calculating the correlation coefficient. I thought I could do a nested for loop to skip the zero values and this is what I have:
for chan1 ~= 0
for chan2 ~=0
c = corrcoef(log(chan1),log(chan2))
end
end
But it seems like that Matlab does not like it when one uses does not equal to in a for loop
Please help me solving this issue.
Thanks!
采纳的回答
the cyclist
2017-7-14
% Some pretend data
chan1 = round(randn(1000,1));
chan2 = round(randn(1000,1));
% Identify pairs where both are nonzero
idxBothNonzero = chan1 > 0 & chan2 > 0;
% Evaluate correlation, using only pairs where both are nonzero
c = corrcoef(log(chan1(idxBothNonzero)),log(chan2(idxBothNonzero)))
2 个评论
Faisal Alghamdi
2017-7-14
Jonas Bauer
2018-9-15
Hi, can you suggest a solution for a matrix with several "0" cells, which should be ignored for corr?
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