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-rw-r--r--doc/snippets/TopicAliasing_block.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/snippets/TopicAliasing_block.cpp b/doc/snippets/TopicAliasing_block.cpp
index 9e897d01c..7d40cfafd 100644
--- a/doc/snippets/TopicAliasing_block.cpp
+++ b/doc/snippets/TopicAliasing_block.cpp
@@ -1,4 +1,4 @@
-Matrix3i mat;
+MatrixXi mat(3,3);
mat << 1, 2, 3, 4, 5, 6, 7, 8, 9;
cout << "Here is the matrix mat:\n" << mat << endl;
mat.bottomRightCorner(2,2) = mat.topLeftCorner(2,2);