/usr/share/gnudatalanguage/lib/dist.pro is in libgnudatalanguage0 0.9.6v2-1build1.
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; NAME:
; DIST
;
;
; PURPOSE:
; Return an array with its values equal to the distance from the
; origin.
;
;
; CATEGORY:
; General utilities
;
;
; CALLING SEQUENCE:
; array = dist(m[,n])
;
;
; INPUTS:
; m,n The dimensions of the array.
;
;
; OUTPUTS:
; array float The resultant array.
;
;
; MODIFICATION HISTORY:
; 14-Mar-2005 : written by SJT
; 21-Jul-2005 : PC faster algorithm
; 06-Oct-2009 : AC
; -- managing DIST([12,24]) and DIST([12,24],13)
; -- managing 0 or Neg Values
;
; LICENCE:
; Copyright (C) 2005, SJT, P. Chanial
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 2 of the License, or
; (at your option) any later version.
;
;-
function DIST, m, n
on_error, 2
;
; When "m" or "n" contain more than one element,
; only the first one is used !
;
if (N_ELEMENTS(m) GT 1) then m=m[0]
if (N_ELEMENTS(n) GT 1) then n=n[0]
;
; if only "m" is provided
if (N_ELEMENTS(n) EQ 0) then n = m
;
if ((m LE 0) OR (n LE 0)) then begin
MESSAGE, "Array dimensions must be greater than 0."
endif
;
x = FINDGEN(m)
x = (x < (m-x))^2
result = FLTARR(m, n, /nozero)
result[*,0] = SQRT(x)
for i = 1l, n/2 do begin
dist = SQRT(x + i^2.) ; i^2. is slightly faster than float(i)^2
result[0,i ] = dist ; [0,i] is way faster than [*,i]
result[0,n-i] = dist
endfor
return, result
end
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