LCFIT

Name

lcfit

Purpose

Fit a lightcurve function (Fourier series plus phase coefficient).

Description

Calling Sequence

lcfit,lon,phang,data,sig,nterms,c,csig

Inputs

lon - Longitude of sub-earth point (0 to 360).
phang - Phase angle (Sun-Object-Earth angle in degrees).
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

NODISPLAY - Flag, if set suppresses all plots from this routine.
TITLE - Title to put on plot (default = no title)
DYMF - The normal magnitude range on the plots is +/- 0.2 mag about the
mean of the extrema of the data. This keyword lets you affect
this scaling. The range is +/- 0.2/dymf (default is dymf=1)

Outputs

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

Keyword Output Parameters

YFIT - Final resulting fitted position for each input data point.
CHISQ - Goodness-of-fit statistic for fit.

Common Blocks

Side Effects

Restrictions

Procedure

Modification History

94/10/10, Written by Marc W. Buie, Lowell Observatory
2008/03/16, MWB, added some keywords
2008/11/20, MWB, fixed bug that could cause returned value of CHISQ to be bad