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	tqrfunc.h - numeric - C++ library with numerical algorithms
	git clone git://src.adamsgaard.dk/numeric
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	tqrfunc.h (821B)
	---
	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