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Member of the polynomials class.

Syntax

[p, s] = polyfit(x, y, n)

[p, s, mu] = polyfit(x, y, n)

Description

Computes a polynomial of a specified degree that fits the input data using the least-squares method.

Examples

Inputs

Name	Description
x	Specifies the x-coordinates of the data you want to fit. x is a matrix.
y	Specifies the y-coordinates of the data you want to fit. y is a matrix of the same size as x.
n	Specifies the degree of the polynomial you want to fit against x and y. n must be less than the length of x. n is a positive integer.

Outputs

Name	Description
p	Returns the coefficients in descending order of the polynomial fit. p is a matrix.
s	Returns the Cholesky factor of the Vandermonde matrix.
mu	Returns the mean and standard deviation of x. LabVIEW uses these values to normalize x to improve the fit. mu is a vector. The first element of mu is the mean, and the second element of mu is the standard deviation.

Examples

[P, S] = polyfit(1:10, rand(1, 10), 5)

[P, S, MU] = polyfit(1:10, [3, 3, 3, 4, 5, 6, 10, 12, 14, 15], 5)

Related Topics

poly
polyval
roots