From 4ea397e11edfb5ef711e52a0d4088943df052d7b Mon Sep 17 00:00:00 2001
From: taw27 <taw27@bf6ca9ba-c028-0410-8290-897cf20841d1>
Date: Tue, 12 Aug 2008 16:30:06 +0000
Subject: Improve numerical stability of reprojection

git-svn-id: svn://cook.msm.cam.ac.uk:745/diff-tomo/dtr@285 bf6ca9ba-c028-0410-8290-897cf20841d1
---
 src/utils.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/utils.c')

diff --git a/src/utils.c b/src/utils.c
index 3fe2e23..30a6e34 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -112,4 +112,9 @@ void matrix_vector_show(const gsl_matrix *m, const gsl_vector *v, const char *pr
 
 }
 
+int sign(double a) {
+	if ( a < 0 ) return -1;
+	if ( a > 0 ) return +1;
+	return 0;
+}
 
-- 
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