commit 8b6f53222b84d1e4f0f1e86b1d321777b58a28dc
author Gael Guennebaud <g.gael@free.fr> Thu Jun 02 15:29:59 2016 +0200
committer Gael Guennebaud <g.gael@free.fr> Thu Jun 02 15:29:59 2016 +0200
tree 50933630ccc644d70f20dadc0cc2c1525d057e0a
parent d616a81294175d1266c8a6af198243a6befc8cc6

bug #1193: fix lpNorm<Infinity> for empty input.

test/array_for_matrix.cpp

diff --git a/test/array_for_matrix.cpp b/test/array_for_matrix.cpp
index db5f3b3..75e6a77 100644
--- a/test/array_for_matrix.cpp
+++ b/test/array_for_matrix.cpp
@@ -144,9 +144,21 @@
 template<typename VectorType> void lpNorm(const VectorType& v)
 {
   using std::sqrt;
+  typedef typename VectorType::RealScalar RealScalar;
   VectorType u = VectorType::Random(v.size());
 
-  VERIFY_IS_APPROX(u.template lpNorm<Infinity>(), u.cwiseAbs().maxCoeff());
+  if(v.size()==0)
+  {
+    VERIFY_IS_APPROX(u.template lpNorm<Infinity>(), RealScalar(0));
+    VERIFY_IS_APPROX(u.template lpNorm<1>(), RealScalar(0));
+    VERIFY_IS_APPROX(u.template lpNorm<2>(), RealScalar(0));
+    VERIFY_IS_APPROX(u.template lpNorm<5>(), RealScalar(0));
+  }
+  else
+  {
+    VERIFY_IS_APPROX(u.template lpNorm<Infinity>(), u.cwiseAbs().maxCoeff());
+  }
+
   VERIFY_IS_APPROX(u.template lpNorm<1>(), u.cwiseAbs().sum());
   VERIFY_IS_APPROX(u.template lpNorm<2>(), sqrt(u.array().abs().square().sum()));
   VERIFY_IS_APPROX(numext::pow(u.template lpNorm<5>(), typename VectorType::RealScalar(5)), u.array().abs().pow(5).sum());
@@ -255,6 +267,8 @@
     CALL_SUBTEST_5( lpNorm(VectorXf(internal::random<int>(1,EIGEN_TEST_MAX_SIZE))) );
     CALL_SUBTEST_4( lpNorm(VectorXcf(internal::random<int>(1,EIGEN_TEST_MAX_SIZE))) );
   }
+  CALL_SUBTEST_5( lpNorm(VectorXf(0)) );
+  CALL_SUBTEST_4( lpNorm(VectorXcf(0)) );
   for(int i = 0; i < g_repeat; i++) {
     CALL_SUBTEST_4( resize(MatrixXcf(internal::random<int>(1,EIGEN_TEST_MAX_SIZE), internal::random<int>(1,EIGEN_TEST_MAX_SIZE))) );
     CALL_SUBTEST_5( resize(MatrixXf(internal::random<int>(1,EIGEN_TEST_MAX_SIZE), internal::random<int>(1,EIGEN_TEST_MAX_SIZE))) );