diagonalization.h

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/*
 *  SPDX-FileCopyrightText: Copyright 2021, Siavash Ameli <sameli@berkeley.edu>
 *  SPDX-License-Identifier: BSD-3-Clause
 *  SPDX-FileType: SOURCE
 *
 *  This program is free software: you can redistribute it and/or modify it
 *  under the terms of the license found in the LICENSE.txt file in the root
 *  directory of this source tree.
 */
 
 
#ifndef _C_TRACE_ESTIMATOR_DIAGONALIZATION_H_
#define _C_TRACE_ESTIMATOR_DIAGONALIZATION_H_
 
// =======
// Headers
// =======
 
#include "../_definitions/types.h"  // IndexType
 
 
// ===============
// Diagonalization
// ===============
 
 
template <typename DataType>
class Diagonalization
{
    public:
 
        // eigh tridiagonal
        static int eigh_tridiagonal(
                DataType* diagonals,
                DataType* subdiagonals,
                DataType* eigenvectors,
                IndexType matrix_size);
 
        // svd bidiagonal
        static int svd_bidiagonal(
                DataType* diagonals,
                DataType* subdiagonals,
                DataType* U,
                DataType* Vt,
                IndexType matrix_size);
};
 
#endif  // _C_TRACE_ESTIMATOR_DIAGONALIZATION_H_