From 40e5a5811c6ffce9b0974e93cdd927cbcf60c157 Mon Sep 17 00:00:00 2001
From: Joe Hunkeler <jhunkeler@gmail.com>
Date: Tue, 11 Aug 2015 16:51:37 -0400
Subject: Repatch (from linux) of OSX IRAF

---
 math/bevington/ppoiss.f | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 math/bevington/ppoiss.f

(limited to 'math/bevington/ppoiss.f')

diff --git a/math/bevington/ppoiss.f b/math/bevington/ppoiss.f
new file mode 100644
index 00000000..4782fde8
--- /dev/null
+++ b/math/bevington/ppoiss.f
@@ -0,0 +1,23 @@
+c function ppoiss.f
+c
+c source
+c   Bevington, page 39.
+c
+c purpose
+c   evaluate poisson probability function
+c
+c usage
+c   result = ppoiss (nobs, averag)
+c
+c description of parameters
+c   nobs   - number of items observed
+c   averag - mean of distribution
+c
+c subroutines and function subprograms required
+c   factor (n)
+c      calculates n factorial for integers
+c
+	function ppoiss (nobs,averag)
+1	ppoiss=((averag**nobs)/factor(nobs))*exp(-averag)
+	return
+	end
-- 
cgit