BIPFIT

Fits a bipolynomial of prescribed orders to a data matrix.

Description

Polynomial fit is a standard in MATLAB. How to work with matrix data in the same way as we do

VEC=polyfit(x,y) ?

BIPFIT is written in this way: it FITs a bipolynomial (matrix BIP) to a data matrix DAT:

BIP=bipfit(DAT,VERHOR)

where VERHOR=size(BIP), defining VERtical and HORizontal polynomial orders.

The surface SUR, which is the BIPolynomial approximation to DAT, can be calculated as:

SUR=bipval(BIP,size(DAT));

Based on:
POLIFIC
See also:
SURFIT

• MATLAB release: MATLAB 6.5 (R13)
• Other requirements: POLYFIC

[Claudia Trozzi]

 

[Jose Albornoz]

Simple but effective!