text: //=================================================================================================
  /*!
  //  \file blaze/math/lapack/clapack/syev.h
  //  \brief Header file for the CLAPACK syev wrapper functions
  //
  //  Copyright (C) 2012-2017 Klaus Iglberger - All Rights Reserved
  //
  //  This file is part of the Blaze library. You can redistribute it and/or modify it under
  //  the terms of the New (Revised) BSD License. Redistribution and use in source and binary
  //  forms, with or without modification, are permitted provided that the following conditions
  //  are met:
  //
  //  1. Redistributions of source code must retain the above copyright notice, this list of
  //     conditions and the following disclaimer.
  //  2. Redistributions in binary form must reproduce the above copyright notice, this list
  //     of conditions and the following disclaimer in the documentation and/or other materials
  //     provided with the distribution.
  //  3. Neither the names of the Blaze development group nor the names of its contributors
  //     may be used to endorse or promote products derived from this software without specific
  //     prior written permission.
  //
  //  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
  //  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  //  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
  //  SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  //  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  //  TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  //  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  //  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  //  ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  //  DAMAGE.
  */
  //=================================================================================================
  
  #ifndef _BLAZE_MATH_LAPACK_CLAPACK_SYEV_H_
  #define _BLAZE_MATH_LAPACK_CLAPACK_SYEV_H_
  
  
  //*************************************************************************************************
  // Includes
  //*************************************************************************************************
  
  #include <blaze/util/Complex.h>
  #include <blaze/util/StaticAssert.h>
  
  
  //=================================================================================================
  //
  //  LAPACK FORWARD DECLARATIONS
  //
  //=================================================================================================
  
  //*************************************************************************************************
  /*! \cond BLAZE_INTERNAL */
  #if !defined(INTEL_MKL_VERSION)
  extern "C" {
  
  void ssyev_( char* jobz, char* uplo, int* n, float*  A, int* lda, float*  w, float*  work, int* lwork, int* info );
  void dsyev_( char* jobz, char* uplo, int* n, double* A, int* lda, double* w, double* work, int* lwork, int* info );
  
  }
  #endif
  /*! \endcond */
  //*************************************************************************************************
  
  
  
  
  namespace blaze {
  
  //=================================================================================================
  //
  //  LAPACK SYMMETRIC MATRIX EIGENVALUE FUNCTIONS (SYEV)
  //
  //=================================================================================================
  
  //*************************************************************************************************
  /*!\name LAPACK symmetric matrix eigenvalue functions (syev) */
  //@{
  inline void syev( char jobz, char uplo, int n, float* A, int lda,
                    float* w, float* work, int lwork, int* info );
  
  inline void syev( char jobz, char uplo, int n, double* A, int lda,
                    double* w, double* work, int lwork, int* info );
  //@}
  //*************************************************************************************************
  
  
  //*************************************************************************************************
  /*!\brief LAPACK kernel for computing the eigenvalues of the given dense symmetric single
  //        precision column-major matrix.
  // \ingroup lapack_eigenvalue
  //
  // \param jobz \c 'V' to compute the eigenvectors of \a A, \c 'N' to only compute the eigenvalues.
  // \param uplo \c 'L' to use the lower part of the matrix, \c 'U' to use the upper part.
  // \param n The number of rows and columns of the given matrix \f$[0..\infty)\f$.
  // \param A Pointer to the first element of the single precision column-major matrix.
  // \param lda The total number of elements between two columns of the matrix A \f$[0..\infty)\f$.
  // \param w Pointer to the first element of the vector for the eigenvalues.
  // \param work Auxiliary array; size >= max( 1, \a lwork ).
  // \param lwork The dimension of the array \a work; see online reference for details.
  // \param info Return code of the function call.
  // \return void
  //
  // This function computes the eigenvalues of a symmetric \a n-by-\a n single precision
  // column-major matrix based on the LAPACK ssyev() function. Optionally, it computes the left
  // and right eigenvectors. The real eigenvalues are returned in ascending order in the given
  // \a n-dimensional vector \a w.
  //
  // The parameter \a jobz specifies the computation of the orthonormal eigenvectors of \a A:
  //
  //   - \c 'V': The eigenvectors of \a A are computed and returned within the matrix \a A.
  //   - \c 'N': The eigenvectors of \a A are not computed.
  //
  // The \a info argument provides feedback on the success of the function call:
  //
  //   - = 0: The computation finished successfully.
  //   - < 0: If info = -i, the i-th argument had an illegal value.
  //   - > 0: If info = i, the algorithm failed to converge; i values did not converge to zero.
  //
  // For more information on the ssyev() function, see the LAPACK online documentation browser:
  //
  //        http://www.netlib.org/lapack/explore-html/
  //
  // \note This function can only be used if a fitting LAPACK library, which supports this function,
  // is available and linked to the executable. Otherwise a call to this function will result in a
  // linker error.
  */
  inline void syev( char jobz, char uplo, int n, float* A, int lda,
                    float* w, float* work, int lwork, int* info )
  {
  #if defined(INTEL_MKL_VERSION)
     BLAZE_STATIC_ASSERT( sizeof( MKL_INT ) == sizeof( int ) );
  #endif
  
     ssyev_( &jobz, &uplo, &n, A, &lda, w, work, &lwork, info );
  }
  //*************************************************************************************************
  
  
  //*************************************************************************************************
  /*!\brief LAPACK kernel for computing the eigenvalues of the given dense symmetric double
  //        precision column-major matrix.
  // \ingroup lapack_eigenvalue
  //
  // \param jobz \c 'V' to compute the eigenvectors of \a A, \c 'N' to only compute the eigenvalues.
  // \param uplo \c 'L' to use the lower part of the matrix, \c 'U' to use the upper part.
  // \param n The number of rows and columns of the given matrix \f$[0..\infty)\f$.
  // \param A Pointer to the first element of the double precision column-major matrix.
  // \param lda The total number of elements between two columns of the matrix A \f$[0..\infty)\f$.
  // \param w Pointer to the first element of the vector for the eigenvalues.
  // \param work Auxiliary array; size >= max( 1, \a lwork ).
  // \param lwork The dimension of the array \a work; see online reference for details.
  // \param info Return code of the function call.
  // \return void
  //
  // This function computes the eigenvalues of a symmetric \a n-by-\a n double precision
  // column-major matrix based on the LAPACK dsyev() function. Optionally, it computes the left
  // and right eigenvectors. The real eigenvalues are returned in ascending order in the given
  // \a n-dimensional vector \a w.
  //
  // The parameter \a jobz specifies the computation of the orthonormal eigenvectors of \a A:
  //
  //   - \c 'V': The eigenvectors of \a A are computed and returned within the matrix \a A.
  //   - \c 'N': The eigenvectors of \a A are not computed.
  //
  // The \a info argument provides feedback on the success of the function call:
  //
  //   - = 0: The computation finished successfully.
  //   - < 0: If info = -i, the i-th argument had an illegal value.
  //   - > 0: If info = i, the algorithm failed to converge; i values did not converge to zero.
  //
  // For more information on the dsyev() function, see the LAPACK online documentation browser:
  //
  //        http://www.netlib.org/lapack/explore-html/
  //
  // \note This function can only be used if a fitting LAPACK library, which supports this function,
  // is available and linked to the executable. Otherwise a call to this function will result in a
  // linker error.
  */
  inline void syev( char jobz, char uplo, int n, double* A, int lda,
                    double* w, double* work, int lwork, int* info )
  {
  #if defined(INTEL_MKL_VERSION)
     BLAZE_STATIC_ASSERT( sizeof( MKL_INT ) == sizeof( int ) );
  #endif
  
     dsyev_( &jobz, &uplo, &n, A, &lda, w, work, &lwork, info );
  }
  //*************************************************************************************************
  
  } // namespace blaze
  
  #endif
  