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-rw-r--r--unsupported/doc/examples/MatrixSine.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/unsupported/doc/examples/MatrixSine.cpp b/unsupported/doc/examples/MatrixSine.cpp
index 2bbf99bbb..e85e6a754 100644
--- a/unsupported/doc/examples/MatrixSine.cpp
+++ b/unsupported/doc/examples/MatrixSine.cpp
@@ -1,4 +1,5 @@
#include <unsupported/Eigen/MatrixFunctions>
+#include <iostream>
using namespace Eigen;