POLYFITN Function

Fits a polynomial to some n dimensional data.

Usage

p = POLYFITN( d, a)

Input Parameters

d—(m, n+1) array of m data points in n independent variables and one dependent variable; d(*, n) contains the dependent variable.

a—n-dimensional array whose nonzero entries designate the nonzero terms of the polynomial; consider for example the case of two independent variables x and y: a coefficient for (xⁱy^j) is computed if and only if a(i, j) is nonzero.

Returned Value

p—An array of the same dimensions as a, containing the polynomial coefficients for the least squares approximation:

p(j1, ..., jn) is the coefficient for:

 

where the x_i are the indeterminants of the polynomial.

Keywords

None.

Example

For an example, see wave/lib/user/examples/polyexam.