L = tril(X)
L = tril(X,k)
tril(X)
is the lower triangular part of X
.
tril(X,k)
is the elements on and below the k
-th diagonal of X
. k = 0
is the main diagonal, k > 0
is above the main diagonal, and k < 0
is below the main diagonal.
tril(ones(4,4),-1) is
0 0 0 0
1 0 0 0
1 1 0 0
1 1 1 0
diag
,triu
(c) Copyright 1994 by The MathWorks, Inc.