From: Steinar H. Gunderson <sesse@debian.org>
Date: Wed, 3 Oct 2007 21:23:53 +0000 (+0200)
Subject: Make a constant out of 455.
X-Git-Url: https://git.sesse.net/?p=foosball;a=commitdiff_plain;h=2d652fe32a6b7e994050be7faad1e6de6cd0847b

Make a constant out of 455.
---

diff --git a/foorank.cpp b/foorank.cpp
index 573a41d..096c185 100644
--- a/foorank.cpp
+++ b/foorank.cpp
@@ -8,6 +8,9 @@
 // integration step size
 static const double step_size = 10.0;
 
+// rating constant (see below)
+static const double rating_constant = 455.0;
+
 using namespace std;
 
 double prob_score(double a, double rd);
@@ -32,7 +35,7 @@ double prodai(double a);
 //
 double prob_score(double a, double rd)
 {
-	return prob_score_real(a, prodai(a), rd/455.0);
+	return prob_score_real(a, prodai(a), rd/rating_constant);
 }
 
 // Same, but takes in Product(a+i, i=1..9) as an argument in addition to a. Faster
@@ -75,7 +78,7 @@ double opponent_rating_pdf(double a, double r1, double mu2, double sigma2, doubl
 {
 	double sum = 0.0;
 	double prodai_precompute = prodai(a);
-	winfac /= 455.0;
+	winfac /= rating_constant;
 	for (double r2 = 0.0; r2 < 3000.0; r2 += step_size) {
 		double x = r2 + step_size*0.5;
 		double probscore = prob_score_real(a, prodai_precompute, (r1 - x)*winfac);