astro (version 1.2)

ellipse: Calculates Ellipse Coordinates

Description

Calculates x,y cartesian position coordinates of an ellipse.

Usage

ellipse(xcen = 0, ycen = 0, a = 10, b = 5, e = 1-b/a, pa = 0)

Arguments

xcen

origin (x)

ycen

origin (y)

a

semi-major axis

b

semi-minor axis

e

ellipticity (1 - b/a)

pa

position angle (right=0, up=90)

Value

x

ellipse coordinates along the x-axis

y

ellipse coordinates along the y-axis

Details

Note that 'b' is redundant if values of 'e' are given.

See Also

The astronomy package: astro.