triu

Syntax

triu(X, [k=0])

Arguments

X is a matrix.

k (optional) is an integer.

Details

If k is not specified: return the upper triangular portion of matrix X.

If k is specified: return the elements on and above the k-th diagonal of X.

Examples

m=matrix(1 2 3, 4 5 6, 7 8 9);
m;
col1 col2 col3
1 4 7
2 5 8
3 6 9 
triu(m);
col1 col2 col3
1 4 7
0 5 8
0 0 9 
triu(m,1);
col1 col2 col3
0 4 7
0 0 8
0 0 0 
triu(m,-1);
col1 col2 col3
1 4 7
2 5 8
0 6 9

Related function: tril