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

Evaluate the polynomial p at the specified values of x.

If x is a vector or matrix, the polynomial is evaluated for each of the elements of x.

When mu is present, evaluate the polynomial for (x - mu(1)) / mu(2).

In addition to evaluating the polynomial, the second output represents the prediction interval, y +/- dy, which contains at least 50% of the future predictions. To calculate the prediction interval, the structured variable s, originating from polyfit, must be supplied.

See also: polyvalm, polyaffine, polyfit, roots, poly.

Package: communications