From: minima <minima>
Date: Thu, 26 Jan 2006 18:08:22 +0000 (+0000)
Subject: fix divide by zero error
X-Git-Tag: R_1_52~2
X-Git-Url: http://dxspider.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=865abb9cb54ef7cee0f30a2d771cf7fcc7db8c90;p=spider.git

fix divide by zero error
---

diff --git a/Changes b/Changes
index 37e64c16..8f0e14c0 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,6 @@
+26Jan06=======================================================================
+1. Fix divide by 0 error in DXBearing (how come this has taken so long to
+appear?).
 22Jan06=======================================================================
 1. Remove +<prefix> from the fronts of comments to fix LoTW dupes.
 18Jan06=======================================================================
diff --git a/perl/DXBearing.pm b/perl/DXBearing.pm
index e7736f8a..e0e9910f 100644
--- a/perl/DXBearing.pm
+++ b/perl/DXBearing.pm
@@ -95,12 +95,12 @@ sub bdist
 	my $e = dr(shift);
 	return (0, 0) if $hn == $n && $he == $e;
 	my $co = cos($he-$e)*cos($hn)*cos($n)+sin($hn)*sin($n);
-	my $ca = atan(abs(sqrt(1-$co*$co)/$co));
+	my $ca = $co ? atan(abs(sqrt(1-$co*$co)/$co)) : $pi;
 	$ca = $pi-$ca if $co < 0;
 	my $dx = 6367*$ca;
 	my $si = sin($e-$he)*cos($n)*cos($hn);
 	$co = sin($n)-sin($hn)*cos($ca);
-	my $az = atan(abs($si/$co));
+	my $az = $co ? atan(abs($si/$co)) : $pi;
 	$az = $pi - $az if $co < 0;
 	$az = -$az if $si < 0;
 	$az = $az+2*$pi if $az < 0;