tril

Arguments

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 — upper triangle
• ones — matrix made of ones
• eye — identity matrix
• diag — diagonal including or extracting