How to add a new column to the beginning of a csv file using matlab

I have a csv file with 30 rows and 20 columns and I want to write a new column of values at the beginning of the file so that the resuling file has 30 rows and 21 columns using matlab. Any help regarding this would be appreciated.

Answer 1

[Jos (10584)]

% Step 1 - Read the file
  M = csvread(filename)
% Step 2 - Add a column to the data
  M = [NewColumn M]
% Step 3 - Save the file
  csvwrite(filename, M)