Return lower triangular part of symbolic matrix
tril( returns a triangular matrix that
retains the lower part of the matrix A)A. The upper triangle of the
resulting matrix is padded with zeros.
Display the matrix retaining only the lower triangle of the original symbolic matrix:
syms a b c A = [a b c; 1 2 3; a + 1 b + 2 c + 3]; tril(A)
ans = [ a, 0, 0] [ 1, 2, 0] [ a + 1, b + 2, c + 3]
Display the matrix that retains the elements of the original symbolic matrix on and below the first superdiagonal:
syms a b c A = [a b c; 1 2 3; a + 1 b + 2 c + 3]; tril(A, 1)
ans = [ a, b, 0] [ 1, 2, 3] [ a + 1, b + 2, c + 3]
Display the matrix that retains the elements of the original symbolic matrix on and below the first subdiagonal:
syms a b c A = [a b c; 1 2 3; a + 1 b + 2 c + 3]; tril(A, -1)
ans = [ 0, 0, 0] [ 1, 0, 0] [ a + 1, b + 2, 0]