tril

lower triangular part of matrix

Calling Sequence

tril(x [,k])

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