y = polyval(p, x)
y = polyval(p, x, S)
y = polyval(p, x, S, mu)
[y, delta] = polyval(p, x, S)
[y, delta] = polyval(p, x, S, mu)
| Parameter | Description |
|---|---|
| p | vector: polynomial coefficients |
| x | query points |
| S | structure: error estimation structure, the second output of polyfit (fields R, df and normr). Required to compute delta. |
| mu | two element vector: centering and scaling, the third output of polyfit. The polynomial is evaluated at (x - mu(1)) / mu(2). |
| Parameter | Description |
|---|---|
| y | vector: Function values |
| delta | vector: standard error estimate for each value, computed from S. |
polyval evaluates polynomial at several points.
When mu is provided, the polynomial is evaluated at the centered and scaled points (x - mu(1)) / mu(2), matching a fit produced by polyfit with three outputs.
When the second output delta is requested, S must be supplied and is used to return an estimate of the standard error of the prediction.
p = [3 2 1];
x = [5 7 9];
R = polyval(p, x)| Version | Description |
|---|---|
| 1.0.0 | initial version |