FOURFIT

Name

fourfit

Purpose

Fit one or more fourier terms to discrete (periodic) data.

Description

Calling Sequence

fourfit,phase,data,sig,nterms,c,csig,YFIT=yfit,CHISQ=chisq

Inputs

phase - Fraction of period (mod or linearly increasing).
data - Measured values.
sig - Uncertainties of the data.
nterms - Number of fourier terms to fit. (2*nterms+1 unknowns)

Optional Input Parameters

Keyword Input Parameters

Outputs

c - fourier series coefficients (see fourfunc)
csig - uncertainties of the coefficients

Keyword Output Parameters

Common Blocks

Side Effects

Restrictions

Procedure

Modification History

94/10/10, Written by Marc W. Buie, Lowell Observatory
2009/02/12, MWB, found and fixed a serious bug that caused the chisq
value to be WRONG. The old value was basically a reduced chisq
as if the number of free parameters were zero. Ouch.