Linear indexing in symmetric matrices

Question

We can access matrices using linear indexing, which follows this pattern

0 1 2

3 4 5

6 7 8

It\'s easy to get the i,j coordinates for this cas

Answer 1

You can use this

idxs = find(triu(true(size(A)))');

which is an update on the answer of Matt. B, because you want row-wise representation.