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-rw-r--r--doc/special_examples/Tutorial_sparse_example.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/doc/special_examples/Tutorial_sparse_example.cpp b/doc/special_examples/Tutorial_sparse_example.cpp
index 002f19f01..830e196ea 100644
--- a/doc/special_examples/Tutorial_sparse_example.cpp
+++ b/doc/special_examples/Tutorial_sparse_example.cpp
@@ -9,6 +9,8 @@ void saveAsBitmap(const Eigen::VectorXd& x, int n, const char* filename);
int main(int argc, char** argv)
{
+ assert(argc==2);
+
int n = 300; // size of the image
int m = n*n; // number of unknows (=number of pixels)