Function: GRTOPH
Purpose: Transformation from grid coordinates to physical coordinates
in a subset.
Category: PHYSICAL COORDINATES
File: cotrans.c
Author: K.G. Begeman
Use: INTEGER GRTOPH ( SET , Input character
SUBSET , Input integer
COORD1 , Input double precision array
COORD2 ) Output double precision array
GRTOPH Returns:
0 transformation successful
1 unknown projection
2 unknown mode
3 CROTA2 = 90.0 for mode 1 and 2
4 CDELT1 and/or CDELT2 equal to zero
5 input sky system unknown
6 output sky system unknown
7 input and output sky system unknown
8 skypro error
9 unknown velocity system
10 rest frequency less than or equal to zero
11 crval equal to zero
12 cdelt equal to zero
13 no matching axis pair found
14 incompatible sky systems
15 cannot do epoch transformations
SET Name of data set.
SUBSET Subset coordinate word.
COORD1 Array containing grid coordinates in substructure
defined by SUBSET. The number of coordinates must
be equal to the dimension of SUBSET.
COORD2 Array containing the corresponding physical
coordinates of the coordinates specified in COORD1.
The units of the physical coordinates is converted
to the units as defined by CUNIT and DUNIT in the
set header.
Related Docs: cotrans.dc2
Updates: Sep 13, 1995: KGB, Document Created.