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# polyval

## PURPOSE

% Evaluate the polynomial at of the specified values for @var{x}. When @var{mu}

## SYNOPSIS

function [y, dy] = polyval (p, x, s, mu)

## DESCRIPTION

```% -*- texinfo -*-
% @deftypefn {Function File} {@var{y} =} polyval (@var{p}, @var{x})
% @deftypefnx {Function File} {@var{y} =} polyval (@var{p}, @var{x}, [], @var{mu})
% Evaluate the polynomial at of the specified values for @var{x}.  When @var{mu}
% is present evaluate the polynomial for (@var{x}-@var{mu}(1))/@var{mu}(2).
% If @var{x} is a vector or matrix, the polynomial is evaluated for each of
% the elements of @var{x}.
% @deftypefnx {Function File} {[@var{y}, @var{dy}] =} polyval (@var{p}, @var{x}, @var{s})
% @deftypefnx {Function File} {[@var{y}, @var{dy}] =} polyval (@var{p}, @var{x}, @var{s}, @var{mu})
% In addition to evaluating the polynomial, the second output
% represents the prediction interval, @var{y} +/- @var{dy}, which
% contains at least 50% of the future predictions.  To calculate the
% prediction interval, the structured variable @var{s}, originating
% form `polyfit', must be present.
% @seealso{polyfit, polyvalm, poly, roots, conv, deconv, residue, filter,
% polyderiv, polyinteg}
% @end deftypefn```

## CROSS-REFERENCE INFORMATION

This function calls:
This function is called by:
• residue % Compute the partial fraction expansion for the quotient of the

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