Given a short brief matrix, such as x = [1.2 2.4 3.6; 1.5 2.3 3.5; 1.35 2.35 3.65] and a label 13, create a fixed format text output whose contents are in a cell array as follows:

     [13] '1:' [1.2]  '2:' [2.4]  '3:' [3.6]
     [13] '1:' [1.5]  '2:' [2.3]  '3:' [3.5]
     [13] '1:' [1.35] '2:' [2.35] '3:' [3.65]

That is to say, add a label before each line of x, and add a column index value before each column of x. Use the delimiter ':' to separate the index value from the column value.