Help with Matrices and Index Position

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Michelle De Luna
Michelle De Luna 2021-2-3
回答： Michelle De Luna 2021-2-3
Hi all,
I have multiple matrices of the same size (500 x 5,000). I am focusing on the first of the matrices, which has some numerical values as well as some NaN's in each column. What I am trying to do is identify only the indices of the numerical values (not the NaN's) in the first matrix so that I can then look at the other matrices and find the value recorded at the same index position. (For example, if the first matrix has a number in the fifth row of the first column, I would like to find the value at the fifth row of the first column for ALL matrices.) Any suggestions? I think it may have to do with sub2ind, but I'm unsure how to apply that function.
Thanks in advance.
x = 500 x 5000 (This variable, "x", represents the matrix I am focusing on, i.e. the one within which I am looking for numerical values.)
day = 500 x 5000
month = 500 x 5000
year = 500 x 5000

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Michelle De Luna
Michelle De Luna 2021-2-3
Thanks to all! I just used the "find" function to find all non-NaN values and used the indices related to these values to solve my question. Again, thanks!
ind = find(~isnan(x))
q = x(ind)
d = day(ind)
m = month(ind)
y = year(ind)
[q d m y]

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