/usr/share/gnudatalanguage/lib/norm.pro is in gnudatalanguage 0.9.4-1ubuntu2.
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; NAME: NORM
;
; PURPOSE:
; For vectors, returns euclidean norm.
; For matrix, returns the infinity norm
;
;
; CATEGORY:
; Algebra
;
;
; CALLING SEQUENCE:
; result=norm(a)
;
;
; INPUTS:
; a Vector or Matrix (can be complex)
;
;
; OUTPUTS:
; result Norm (see Purpose)
;
;
; IDL DIFFERENCES:
; scalars are treated as vectors
; double=0 does not convert the result to float (like total)
;
;
; MODIFICATION HISTORY:
; 12-Jan-2006 : written by Pierre Chanial
;
; LICENCE:
; Copyright (C) 2006, 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 norm, array, double=double
on_error, 2
dim = size(array, /n_dimensions)
switch dim of
0 :
1 : return, sqrt(total(abs(array)^2, double=double, /NaN))
2 : return, max(total(abs(array), 1, double=double, /NaN))
else : message, 'Input must be a vector or a matrix.'
endswitch
end
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