tril - lower triangular part of matrix

Calling Sequence

tril(x [,k])

Parameters

• x : matrix (real, complex, polynomial, rational)
• k : integer (default value 0)

Description

Lower triangle part of a matrix. tril(x,k) is made by entries below the kth diagonal : k>0 (upper diagonal) and k<0 (diagonals below the main diagonal).

Examples

s=poly(0,'s');
tril([s,s;s,1])
tril([1/s,1/s;1/s,1])
 

See Also

triu  ones  eye  diag