lower triangular part of matrix
tril(x [,k])
matrix (real, complex, polynomial, rational)
integer (default value 0)
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).
s=poly(0,'s'); tril([s,s;s,1]) tril([1/s,1/s;1/s,1]) | ![]() | ![]() |