How can I identify the indices of rows containing all NaNs from matrix?

I have very large matrices, in which some rows contain all NaN. I don't want to remove these rows. But I wish to identify which index contains all NaN. I have seen code for removing such rows, but how can I extract the index value?

I am not very familiar with MATLAB. Thanks in advance.

Answer 1

[Star Strider]

Try this:

M = [rand(3,5); NaN(1,5); rand(4,5); NaN(1,5); rand(2,5)];      % Create Data
NaN_rows = find(all(isnan(M),2));                               % Identify ‘NaN’ Rows By Index

[Deepa T]

Thank you very much. This is exactly what i wanted to do.

[Star Strider]

As always, my pleasure!

Answer 2

[Chandrasekhar]

% idenfity NaN's in the matrix

k = isnan(a);
% find the indices of NaN's
  find(k==1);

[Deepa T]

Thank you for your reply. This query helps me to identify every NaN in the dataset, not just the rows with all NaN.