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diff --git a/src/armadillo/include/armadillo_bits/newarp_TridiagEigen_bones.hpp b/src/armadillo/include/armadillo_bits/newarp_TridiagEigen_bones.hpp
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+// SPDX-License-Identifier: Apache-2.0
+// 
+// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
+// Copyright 2008-2016 National ICT Australia (NICTA)
+// 
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// ------------------------------------------------------------------------
+
+
+namespace newarp
+{
+
+
+//! Calculate the eigenvalues and eigenvectors of a symmetric tridiagonal matrix.
+//! This class is a wrapper of the Lapack functions `_steqr`.
+template<typename eT>
+class TridiagEigen
+  {
+  private:
+
+  blas_int n;
+  Col<eT>  main_diag;  // Main diagonal elements of the matrix
+  Col<eT>  sub_diag;   // Sub-diagonal elements of the matrix
+  Mat<eT>  evecs;      // To store eigenvectors
+  bool     computed;
+
+
+  public:
+
+  //! Default constructor. Computation can
+  //! be performed later by calling the compute() method.
+  inline TridiagEigen();
+
+  //! Constructor to create an object that calculates the eigenvalues
+  //! and eigenvectors of a symmetric tridiagonal matrix `mat_obj`.
+  inline TridiagEigen(const Mat<eT>& mat_obj);
+
+  //! Compute the eigenvalue decomposition of a symmetric tridiagonal matrix.
+  inline void compute(const Mat<eT>& mat_obj);
+
+  //! Retrieve the eigenvalues.
+  inline Col<eT> eigenvalues();
+
+  //! Retrieve the eigenvectors.
+  inline Mat<eT> eigenvectors();
+  };
+
+
+}  // namespace newarp