How to insert a columns of NaNs in between a matrix at multiple places

I have a matrix of 1440X4792 and I want to insert few columns (lets say 1277) of NaNs at different positions say (column positions : 1,3,6,99,100...)

Finally, my matrix will become 1440X6069 in which 1277 columns are NaN columns which we have inserted, rest of the 4792 columns remain same.

Answer 1

[madhan ravi]

[m, n] = size(matrix); 
Wanted = nan(m, n + numel(col_pos));
Wanted(:,setdiff(1:size(Wanted,2),col_pos)) = matrix

[Mohammed Yousuf]

This error is to be seen

Unable to perform assignment because the size of the left side is 1440-by-4889 and

the size of the right side is 1440-by-4792.