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# work/mixpp/bdm/math/chmat.h

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    00001
    00013 #ifndef CHMAT_H
    00014 #define CHMAT_H
    00015
    00016 #include <itpp/itbase.h>
    00017 #include "libDC.h"
    00018
    00019 using namespace itpp;
    00020
    00026 class chmat : public sqmat {
    00027 protected:
    00029         mat Ch;
    00030 public:
    00031
    00032         void opupdt ( const vec &v, double w );
    00033         mat to_mat();
    00034         void mult_sym ( const mat &C );
    00035         void mult_sym ( const mat &C , chmat &U ) const;
    00036         void mult_sym_t ( const mat &C );
    00037         void mult_sym_t ( const mat &C, chmat &U ) const;
    00038         double logdet() const;
    00039         vec sqrt_mult ( const vec &v ) const;
    00040         double qform ( const vec &v ) const;
    00041         double invqform ( const vec &v ) const;
    00042         void clear();
    00043         void add ( const chmat &A2, double w=1.0 ) {};
    00045         void inv ( chmat &Inv ) const   { ( Inv.Ch ) = itpp::inv ( Ch ).T();}; //Fixme: can be more efficient
    00046         ;
    00047 //      void inv ( mat &Inv );
    00048
    00050         virtual ~chmat() {};
    00052         chmat ( const int dim0 ) : sqmat ( dim0 ),Ch ( dim0,dim0 ) {};
    00054         chmat ( const vec &v) : sqmat ( v.length() ),Ch ( diag(sqrt(v)) ) {};
    00056         chmat ( const chmat &Ch0) : sqmat ( Ch0.dim),Ch ( Ch0.dim,Ch0.dim ) {Ch=Ch0.Ch;};
    00058         chmat ( const mat &M ) : sqmat ( M.rows() ),Ch ( M.rows(),M.cols() ) {
    00059                 mat Q;
    00060                 it_assert_debug ( M.rows() ==M.cols(),"chmat:: input matrix must be square!" );
    00061                 Ch=chol ( M );
    00062         };
    00064         mat & _Ch() {return Ch;}
    00066         void setD ( const vec &nD ) {Ch=diag ( sqrt(nD) );}
    00068         void setD ( const vec &nD, int i ) {for ( int j=i;j<nD.length();j++ ) {Ch( j,j ) =sqrt(nD ( j-i ));}} //Fixme can be more general
    00069
    00071         chmat& operator += ( const chmat &A2 );
    00072         chmat& operator -= ( const chmat &A2 ) ;
    00073 };
    00074
    00075
    00078 inline chmat& chmat::operator += ( const chmat &A2 )  {this->add ( A2 );return *this;}
    00080 inline chmat& chmat::operator -= ( const chmat &A2 )  {this->add ( A2,-1.0 );return *this;}
    00081 #endif // CHMAT_H