fix compile errors in Tridiagonalization and in doc examples

2 files changed, 4 insertions, 4 deletions

diff --git a/doc/examples/class_FixedVectorBlock.cpp b/doc/examples/class_FixedVectorBlock.cpp
index 9be7d8d71..c88c9fbf1 100644
--- a/doc/examples/class_FixedVectorBlock.cpp
+++ b/doc/examples/class_FixedVectorBlock.cpp
@@ -11,10 +11,10 @@ firstTwo(MatrixBase<Derived>& v)
 }
 
 template<typename Derived>
-const Eigen::VectorBlock<Derived, 2>
+const Eigen::VectorBlock<const Derived, 2>
 firstTwo(const MatrixBase<Derived>& v)
 {
-  return Eigen::VectorBlock<Derived, 2>(v.derived(), 0);
+  return Eigen::VectorBlock<const Derived, 2>(v.derived(), 0);
 }
 
 int main(int, char**)
diff --git a/doc/examples/class_VectorBlock.cpp b/doc/examples/class_VectorBlock.cpp
index 2f02c8f69..dc213df20 100644
--- a/doc/examples/class_VectorBlock.cpp
+++ b/doc/examples/class_VectorBlock.cpp
@@ -11,10 +11,10 @@ segmentFromRange(MatrixBase<Derived>& v, int start, int end)
 }
 
 template<typename Derived>
-const Eigen::VectorBlock<Derived>
+const Eigen::VectorBlock<const Derived>
 segmentFromRange(const MatrixBase<Derived>& v, int start, int end)
 {
-  return Eigen::VectorBlock<Derived>(v.derived(), start, end-start);
+  return Eigen::VectorBlock<const Derived>(v.derived(), start, end-start);
 }
 
 int main(int, char**)