tril(1)

NAME
tril - lower triangular part of matrix

CALLING SEQUENCE
tril(x [,k])

PARAMETERS

x   : matrix

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).