check if data is only nan in matlab

You can use the isnan function in MATLAB to check whether a value or a matrix element is NaN. If you want to check if a matrix contains only NaNvalues, you can use the all function along with isnan function to evaluate whether all the elements of the matrix are NaN. Here is an example code snippet:

main.m
% Example Matrix
A = [NaN NaN; NaN NaN];

% Check if all elements are NaN
if all(isnan(A(:)))
    disp('All elements of A are NaN');
else
    disp('A contains non-NaN elements');
end
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In this example, all(isnan(A(:))) tests all the elements of matrix A to evaluate whether they are NaN or not. The (:) operator is used to convert the matrix A to a column vector. If all elements of A are NaN, then it will print 'All elements of A are NaN'. Otherwise, it will print 'A contains non-NaN elements'.