--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/specfun/gammai.m	Fri Jan 30 21:23:00 1998 +0000
@@ -0,0 +1,43 @@
+## Copyright (C) 1998 John W. Eaton
+##
+## This file is part of Octave.
+##
+## Octave 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, or (at your option)
+## any later version.
+##
+## Octave is distributed in the hope that it will be useful, but
+## WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+## General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with Octave; see the file COPYING.  If not, write to the Free
+## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+## 02111-1307, USA.
+
+## usage: gammai (a, x)
+##
+## Compute the incomplete gamma function
+##
+##   gammai (a, x) = (\int_0^x exp(-t) t^(a-1) dt) / gamma(a).
+##
+## If a is scalar, then gammai (a, x) is returned for each element of x
+## and vice versa.
+##
+## If neither a nor x is scalar, the sizes of a and x must agree, and
+## gammainc is applied for corresponding elements of x and a.
+
+## Author: jwe
+## Created: 30 Jan 1998
+
+function retval = gammai (a, x)
+
+  if (nargin == 2)
+    retval = gammainc (x, a);
+  else
+    usage ("gammai (a, x)");
+  endif
+
+endfunction