NAME: PMOD PURPOSE: Find the positive modulo value of a number. CATEGORY: CALLING SEQUENCE: out = pmod(in,m) INPUTS: in = input value (may be an array). in m = divisor. in KEYWORD PARAMETERS: OUTPUTS: out = Remainder of in divided by m. out COMMON BLOCKS: NOTES: Notes: output is always in the range 0 to m-1. To see the difference between mod and pmod try: plot,(indgen(500)-250) mod 50, yran=[-60,60] plot,pmod(indgen(500)-250, 50), yran=[-60,60] MODIFICATION HISTORY: R. Sterner, 1996 May 12 R. Sterner, 2010 May 04 --- Converted arrays from () to []. Copyright (C) 1996, Johns Hopkins University/Applied Physics Laboratory This software may be used, copied, or redistributed as long as it is not sold and this copyright notice is reproduced on each copy made. This routine is provided as is without any express or implied warranties whatsoever. Other limitations apply as described in the file disclaimer.txt.