svd.h

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#ifndef AIMS_MATH_SVD_H
#define AIMS_MATH_SVD_H

#include <aims/def/general.h>

template <class T> class AimsData;

template< class T >
class AimsSVD
{
public:

  enum SVDReturnType
  {
    MatrixOfSingularValues,
    VectorOfSingularValues
  };

  AimsSVD( SVDReturnType rt=MatrixOfSingularValues ) : retType( rt ) { }
  virtual ~AimsSVD() { }

  void setReturnType( SVDReturnType rt ) { retType = rt; }

  AimsData< T > doit( AimsData< T >&, AimsData< T > *v = NULL );

  void sort( AimsData< T >&, AimsData< T >&, AimsData< T > *v = NULL );

  AimsData< T > backwardSubstitution( const AimsData< T >& U, 
                                      const AimsData< T >& W, 
                                      const AimsData< T >& V, 
                                      const AimsData< T >& S );

private:

  SVDReturnType retType;
};

#endif