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Convert a linear index to subscripts of a trinagular matrix.
An example of trinagular matrix linearly indexed follows
N = 4; A = -repmat (1:N,N,1); A += repmat (diagind, N,1) - A.'; A = tril(A) => A = 1 0 0 0 2 5 0 0 3 6 8 0 4 7 9 10
The following example shows how to convert the linear index ‘6’ in the 4-by-4 matrix of the example into a subscript.
[r, c] = ind2sub_tril (4, 6) => r = 2 c = 3
when idx is a row or column matrix of linear indeces then r and c have the same shape as idx.
See also: vech, ind2sub, sub2ind_tril.