polyPredict

polyPredict(model, X)

Alias: poly1d

model is a numeric vector indicating the polynomial coefficients in ascending powers. It must not contain NULL values.

X is a numeric scalar or vector indicating the independent variable. It must not contain NULL values.

Calculate the value of the dependent variable for a one-dimensional polynomial based on the given coefficients and independent variable.

Return value: A numeric vector of the same length as X.

For a third-degree polynomial 2x^3+3x^2+4x+5 with coefficients [5,4,3,2] in ascending powers, the value of the dependent variable can be calculated:

model = [5,4,3,2]
x = [2.0,5.0,3.0,3.0,4.0,5.0]
y = poly1d(model,x)
y
//output: [41,350,98,98,197,350]

With the model and y in the above example, the coefficients can be calculated with polyFit:

polyFit(x,y,3)
// output
[5,4,3,2]

Related function: polyFit