Extract first non-NaN of each row without loop
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Hello, from a matrix where each row contains at least one non-NaN, is there away to extract the FIRST non-nan of each row without using a loop?
A=[NaN,444,NaN,NaN,41;
NaN,NaN,NaN,222,NaN;
NaN,NaN,554,554,NaN;
125,747,21,NaN,4;
NaN,NaN,NaN,43,NaN;
NaN,98,NaN,75,NaN;
NaN,22,NaN,NaN,NaN]
From matrix A, I would like to arrive to B
B=[444;222;554;125;43;98;22]
Thanks
Accepted Answer
Walter Roberson
on 24 Oct 2021
A=[NaN,444,NaN,NaN,41;
NaN,NaN,NaN,222,NaN;
NaN,NaN,554,554,NaN;
125,747,21,NaN,4;
NaN,NaN,NaN,43,NaN;
NaN,98,NaN,75,NaN;
NaN,22,NaN,NaN,NaN]
B = A(sub2ind(size(A), (1:size(A,1)).', sum(cumprod(isnan(A),2),2)+1))
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