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| Syntax |
triu(A)A, k)
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| See Also | tril , diag , identity |
triu(A) returns the upper triangular part of A
triu(X,k)
returns the elements on and above the k-th diagonal
of A where
k is an integer, real or double-precision scalar.
The value
k = 0 corresponds to the main diagonal,
k > 0 corresponds to above the main diagonal,
and k < 0 corresponds to below the main diagonal.
A = {[1, 2], [3, 4]}
triu(A)
O-Matrix will respond
{
[ 1 , 2 ]
[ 0 , 4 ]
}
If you enter
A = {[1, 2 , 3], [4, 5, 6], [7, 8, 9]}
k = 1
triu(A, k)
O-Matrix will respond
{
[ 0 , 2 , 3 ]
[ 0 , 0 , 6 ]
[ 0 , 0 , 0 ]
}