tqrfunc.h - numeric - C++ library with numerical algorithms
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       tqrfunc.h (821B)
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            1 // Make sure header is only included once
            2 #ifndef qrfunc_h_
            3 #define qrfunc_h_
            4 
            5 #include <armadillo>
            6 #include "header.h"
            7 
            8 // QR structure
            9 class QR {
           10   private:
           11     // System size
           12     const Lengthtype n;
           13 
           14   public:
           15     //// Data
           16 
           17     // Input data
           18     arma::mat A;
           19 
           20     // QR decomposition matrices
           21     arma::mat Q;
           22     arma::mat R;
           23 
           24     //// Prototype functions
           25 
           26     // Constructor prototype
           27     QR(arma::mat &A);
           28 
           29     // Destructor
           30     ~QR();
           31 
           32     // Return system size
           33     Lengthtype size();
           34 
           35     // QR decomposition of Armadillo matrix A, returning R
           36     // and modified A (=Q)
           37     void decomp();
           38 
           39     // Backsubstitution of triangular system
           40     arma::vec backsub(arma::vec &b);
           41 
           42     // Absolute value of the determinant of matrix R
           43     Floattype det();
           44 
           45     // Inverse of matrix A
           46     arma::mat inverse();
           47 };
           48 
           49 #endif