tril (MATLAB Functions)

MATLAB Function Reference

tril

Lower triangular part of a matrix

Syntax

```
L = tril(X)
L = tril(X,k)
```

Description

L = tril(X) returns the lower triangular part of X.

L = tril(X,k) returns the elements on and below the kth diagonal of X. k = 0 is the main diagonal, k > 0 is above the main diagonal, and k < 0 is below the main diagonal.

Examples

tril(ones(4,4),-1)

ans =

    0    0    0    0
    1    0    0    0
    1    1    0    0
    1    1    1    0

See Also

diag, triu

treeplot trimesh