/usr/share/gnudatalanguage/lib/real_part.pro is in libgnudatalanguage0 0.9.7-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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; NAME: REAL_PART
;
; PURPOSE:
;
; This function returns the real part of a complex number/array
; (of any dimension), in a type consistant to the input variable
; (either FLOAT or DOUBLE).
; If the type of the input is convertible (BYTE, INT, STRING, ...)
; it is promote to FLOAT type.
;
; CATEGORY:
;
; CALLING SEQUENCE:
;
; Result = REAL_PART(Z)
;
; INPUTS:
;
; Z: A scalar or array. Z may be of any numeric type.
; If Z is not complex then the result is simply converted to
; floating-point (single-precision for all integer types,
; double precision for type double). If Z is STRING, it is converted
; to FLOAT when possible, despite, it is converted to "0.0"
;
; OPTIONAL INPUTS: none
;
; KEYWORD PARAMETERS: none
;
; OUTPUTS: A scale or an array of the same size of the input.
;
; OPTIONAL OUTPUTS: none
;
; COMMON BLOCKS: none
;
; SIDE EFFECTS: none
;
; RESTRICTIONS: Behavior on Objects/Structures/Pointers not clear !
;
; PROCEDURE:
;
; EXAMPLE:
;
; print, REAL_PART(INDGEN(10))
; print, REAL_PART(COMPLEXARR(2)+1)
; print, REAL_PART(['s','10,'])
;
; MODIFICATION HISTORY:
; Written by: Alain Coulais, 06 June 2008.
;
; LICENCE:
; Copyright (C) 2008, Alain Coulais
;
; 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 real_part, z
;
ON_ERROR, 2
;
if (N_PARAMS() lt 1) then MESSAGE, 'Incorrect number of arguments.'
;
type=SIZE(z, /TYPE)
;
; When input is a DOUBLE (ie DOUBLE or DCOMPLEX) we
; When input is not of DOUBLE type, it is converted to FLOAT type ...
;
; DOUBLE: type == 5
; DCOMPLEX: type == 9
;
if ((type EQ 5L) OR (type EQ 9L)) then begin
return, DOUBLE(z)
endif else begin
return, FLOAT(z)
endelse
;
end
;
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