LCFUN
Name
lcfun
Purpose
Compute a lightcurve function (Fourier series plus phase coefficient).
Description
This is to be used in cases where you already know the fundamental period.
The input independent variable is assumed to be reduced to phase of a
fundamental period already. The integer part of the number is not used
by the function.
Category
Mathematical
Calling Sequence
lcfun,x,c,f,pder
Inputs
x - independent variable (longitude, between 0 and 360)
c - fourier series coefficients
0 - beta -> linear phase coefficient
1 - a(0) -> constant term
2 - a(1) -> cos(x2pi)
3 - b(1) -> sin(x2pi)
4 - a(2) -> cos(2x2pi)
5 - b(2) -> sin(2x2pi)
and so on for as many elements as in c
Optional Input Parameters
PHANG - phase angle of each observation, will be saved to common, if
not provided will use the last values saved to common block.
Angle is in degrees.
Keyword Input Parameters
Outputs
f - Evaluated function value
pder - (Optional) partial derivatives
Keyword Output Parameters
Common Blocks
lc_com - one variable, phang, that is used to save the phase angle from
one call to the next in case of calling the lcfun or lcfunf
from a canned routine that cannot be taught to pass the
extra independent variable.
Side Effects
Restrictions
Procedure
Modification History
94/10/10, Written by Marc W. Buie, Lowell Observatory