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C++ API

: 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: octave