polyfit

Polynomial curve fitting.

Syntax

• p = polyfit(x, y, n)

Input argument

• x - vector: query points
• y - vector: fitted values at query points
• n - positive scalar: degree of polynomial fit

Output argument

• p - vector: Least-squares fit polynomial coefficients

Description

p = polyfit(x, y, n) returns the coefficients for a polynomial p(x) of degree n that is a best fit for the data in y.

Example

x = linspace(0, 8 * pi, 15);
y = sin(x);
p = polyfit(x, y, 7)

See also

roots, poly.

History

Author

Allan CORNET