# polyval

## Purpose

Polynomial evaluation.

## Synopsis

    y = polyval(p,S)

## Description

`y` `=` `polyval(p,S)`, where `p` is a vector whose elements are the coefficients of a polynomial in descending powers, is the value of the polynomial evaluated at `S`. If `S` is a matrix or vector, the polynomial is evaluated at each of the elements.

`polyvalm(p,S)`, with `S` a matrix, evaluates the polynomial in a matrix sense. See `polyvalm` for more information.

## Examples

The polynomial

is evaluated at s = 5 with

    p = [3 2 1];
    polyval(p,5)

which results in

    ans =
         86

For another example, see ``polyfit.

## See Also

    conv, poly, polyfit, polyvalm, residue, roots

(c) Copyright 1994 by The MathWorks, Inc.