text: /*################################################################################
    ##
    ##   Copyright (C) 2011-2018 Keith O'Hara
    ##
    ##   This file is part of the StatsLib C++ library.
    ##
    ##   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.
    ##
    ################################################################################*/
  
  /*
   * for internal use only; used to switch between the different matrix libraries
   */
  
  //
  // matrix trace
  
  #ifdef STATS_USE_ARMA
  template<typename T>
  statslib_inline
  T
  trace(const ArmaMat<T>& X)
  {
      return arma::trace(X);
  }
  #endif
  
  #ifdef STATS_USE_BLAZE
  template<typename Ta, bool Tb>
  statslib_inline
  Ta
  trace(const BlazeMat<Ta,Tb>& X)
  {
      return blaze::trace(X);
  }
  #endif
  
  #ifdef STATS_USE_EIGEN
  template<typename Ta, int iTr, int iTc>
  statslib_inline
  Ta
  trace(const EigMat<Ta,iTr,iTc>& X)
  {
      return X.trace();
  }
  #endif
  