how can i remove efficiently nan values from columns without deleting the column itself ?

for ex :

 A =  1   2   3       
     nan  4  nan
     nan nan  5
     4    5   6

required output

 A = 1 2 3
     4 4 5
       5 6

[James Tursa]

Your posted matrix result is not rectangular. You can't have this in a numeric matrix. Is this really what you want for an output or is this a typo? I.e., do you really want the resulting columns to potentially have different numbers of elements? (In which case maybe a cell array would be what you want).

Answer 1

[Andrei Bobrov]

i0 = ~isnan(A);
ii = sort(i0,'descend');
out = nan(size(A));
out(ii)=A(i0);