NAME: sphrec PURPOSE: (one line only) Convert from spherical to rectangular coordinates DESCRIPTION: CATEGORY: Mathematical CALLING SEQUENCE: sphrec,r,lat,lon,x,y,z INPUTS: r - distance from origin lat - angular distance from x-y plane (radians) lon - longitude (angle from x axis) in radians OPTIONAL INPUT PARAMETERS: KEYWORD INPUT PARAMETERS: OUTPUTS: x - Cartesian x-coordinate (same units as r). y - Cartesian y-coordinate (same units as r). z - Cartesian z-coordinate (same units as r). KEYWORD OUTPUT PARAMETERS: COMMON BLOCKS: SIDE EFFECTS: RESTRICTIONS: rank and size of all inputs must match or be scalar. PROCEDURE: MODIFICATION HISTORY: 2011/11/29, Written by Marc W. Buie, Southwest Research Institute guided by SPTORC.F written by David J. Tholen, and sphrec.f written by Marc Buie