From ce4144779302751ded706304e0db110acb085d6f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=BCrg=20Lehni?= <juerg@scratchdisk.com>
Date: Tue, 16 Jun 2015 12:30:25 +0200
Subject: [PATCH] Prevent invalid invinite solutions in
 Numerical.solveQuadratic()

Closes #708
---
 src/util/Numerical.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/util/Numerical.js b/src/util/Numerical.js
index da7e1b80..0796429a 100644
--- a/src/util/Numerical.js
+++ b/src/util/Numerical.js
@@ -176,12 +176,12 @@ var Numerical = new function() {
                 B = b,
                 D;
             b /= 2;
-            D = b * b - a * c;          // Discriminant
+            D = b * b - a * c; // Discriminant
             /*
              * If the discriminant is very small, we can try to pre-condition
              * the coefficients, so that we may get better accuracy
              */
-            if (abs(D) < MACHINE_EPSILON) {
+            if (D !== 0 && abs(D) < MACHINE_EPSILON) {
                 // If the geometric mean of the coefficients is small enough
                 var pow = Math.pow,
                     gmC = pow(abs(a*b*c), 1/3);