/usr/share/gnudatalanguage/astrolib/randomchi.pro is in gdl-astrolib 2018.02.16+dfsg-1.
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:
; RANDOMCHI
; PURPOSE:
; GENERATE CHI-SQUARE DISTRIBUTED RANDOM VARIABLES.
;
; AUTHOR : BRANDON C. KELLY, STEWARD OBS., SEP 2005
;
; INPUTS :
;
; SEED - THE SEED FOR THE RANDOM NUMBER GENERATOR, CAN BE UNDEFINED.
; DOF - THE DEGREES OF FREEDOM FOR THE CHI-SQUARED DISTRIBUTION.
;
; OPTIONAL INPUTS :
;
; NRAND - THE NUMBER OF RANDOM NUMBERS TO DRAW
;-
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function randomchi, seed, dof, nrand
if n_params() lt 2 then begin
print, 'Syntax- result = randomchi( seed, dof[, nrand] )'
return, -1
endif
if n_elements(nrand) eq 0 then nrand = 1
alpha = dof / 2.0
beta = 0.5
chisqr = randomgam( seed, alpha, beta, nrand )
return, chisqr
end
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