;a simple program to convert from spherical polar to Cartesian coordinates
;; INPUTS:
; x,y,z are Cartesian vector components
; r is the vector magnitude.
; theta is the polar angle in RADIANS in spherical polar coordinates
; phi is the azimuth angle in RADIANS in spherical polar coordinates
; Created by: Robert Lillis (rlillis@ssl.Berkeley.edu)
pro spc2cart, r, theta, phi, x, y, z
x = r*sin(theta)*cos(phi)
y = r*sin(theta)*sin(phi)
z = r*cos(theta)
end