Extracting lower triangle excluding the main diagonal elements to a string

Hi all,

How to extract the lower triangle part of a matrix "excluding" the main diagonal elements, and put it as a string that has "\n" at the end of ech row?

For example:

A=[1 2 3 4; 0 6 7 8; 9 10 11 12; 13 14 15 16];

The output should be this:

B="0 \n 9 10 \n 13 14 15";

Answer 1

[Guillaume]

B = strjoin(arrayfun(@(row) strjoin(compose('%d', A(row, 1:row-1)), ' '), 2:size(A, 1), 'UniformOutput', false), '\n')

is one way. Or use an explicit loop.