update

1 files changed, 10 insertions, 0 deletions

diff --git a/eigen/doc/snippets/Tridiagonalization_decomposeInPlace.cpp b/eigen/doc/snippets/Tridiagonalization_decomposeInPlace.cpp
new file mode 100644
index 0000000..93dcfca
--- /dev/null
+++ b/eigen/doc/snippets/Tridiagonalization_decomposeInPlace.cpp
@@ -0,0 +1,10 @@
+MatrixXd X = MatrixXd::Random(5,5);
+MatrixXd A = X + X.transpose();
+cout << "Here is a random symmetric 5x5 matrix:" << endl << A << endl << endl;
+
+VectorXd diag(5);
+VectorXd subdiag(4);
+internal::tridiagonalization_inplace(A, diag, subdiag, true);
+cout << "The orthogonal matrix Q is:" << endl << A << endl;
+cout << "The diagonal of the tridiagonal matrix T is:" << endl << diag << endl;
+cout << "The subdiagonal of the tridiagonal matrix T is:" << endl << subdiag << endl;