From 9fb08c2f9e208acff6c8e3d3b8ee98850922e996 Mon Sep 17 00:00:00 2001
From: Thomas Neidhart <tn@apache.org>
Date: Tue, 2 Jul 2013 19:49:48 +0000
Subject: [PATCH] Do sanity checks first to prevent NullPointerException.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1499076 13f79535-47bb-0310-9956-ffa450edef68
---
 src/main/java/org/apache/commons/math3/util/MathArrays.java | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/main/java/org/apache/commons/math3/util/MathArrays.java b/src/main/java/org/apache/commons/math3/util/MathArrays.java
index d13d8bcf8..1aa56cc7d 100644
--- a/src/main/java/org/apache/commons/math3/util/MathArrays.java
+++ b/src/main/java/org/apache/commons/math3/util/MathArrays.java
@@ -677,13 +677,15 @@ public class MathArrays {
                                    double[] ... yList)
         throws NullArgumentException,
                DimensionMismatchException {
-        final int yListLen = yList.length;
-        final int len = x.length;
 
         // Consistency checks.
         if (x == null) {
             throw new NullArgumentException();
         }
+
+        final int yListLen = yList.length;
+        final int len = x.length;
+
         for (int j = 0; j < yListLen; j++) {
             final double[] y = yList[j];
             if (y == null) {