pracma (version 1.1.6)

polyval: Evaluating a Polynomial

Description

Evaluate polynomial given as a numeric vector.

Usage

polyval(p, x)

Arguments

p

vector representing a polynomial

x

vector of values where to evaluate the polynomial

Value

• vector of values

Details

Evaluate the polynomial given by p at the values specified by the elements of x. If x is a matrix, the polynomial will be evaluated at each element and a matrix returned.

See Also

poly, roots

Examples

# Evaluate 3 x^2 + 2 x + 1 at x = 5, 7, and 9
  p = c(3, 2, 1);
  polyval(p, c(5, 7, 9))  # 86  162  262