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// NOX: An Object-Oriented Nonlinear Solver Package
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#ifndef NOX_LAPACK_MATRIX_H
#define NOX_LAPACK_MATRIX_H
#include "NOX_Common.H"
namespace NOX {
namespace LAPACK {
//! A simple square matrix class for use by NOX::LAPACK::Group.
/*!
* The matrix is stored as a std::vector<T> array. It is templated so
* it can store entries of different types. For example, the LOCA
* LAPACK group stores a complex matrix for Hopf tracking.
*/
template <typename T>
class Matrix {
public:
//! Create an empty matrix
Matrix() : p(0), q(0), entries() {}
//! Create a m x n matrix with all entries zero
Matrix(int m, int n) : p(m), q(n), entries(m*n) {}
//! Copy constructor
Matrix(const Matrix& a) :
p(a.p), q(a.q), entries(a.entries) {}
//! Destructor
~Matrix() {}
//! Access the (i,j) entry of A
T& operator()(int i, int j) { return entries[i + (p*j)]; }
//! Access the (i,j) entry of A
const T& operator()(int i, int j) const { return entries[i + (p*j)]; }
//! Scale the matrix by a constant value.
/*! This is needed to manipulate matrices in the LOCA library
routines.
*/
void scale(T v ) {
for (int i=0; i<p*q; i++)
entries[i] *= v;
}
//! Prints out the matrix
bool print(std::ostream& stream) const {
for (int i=0; i<p; i++) {
stream << "[ ";
for (int j=0; j<q; j++)
stream << operator()(i,j) << " ";
stream << "]" << std::endl;
}
return ! stream.fail ();
}
//! Returns the number of rows in the matrix
int numRows() const { return p; }
//! Returns the number of columns in the matrix
int numCols() const { return q; }
private:
//! This is a p x q matrix
int p, q;
//! Entries of the matrix
std::vector<T> entries;
};
} // namespace LAPACK
} // namespace NOX
template <typename T>
std::ostream& operator<<(std::ostream& stream, const NOX::LAPACK::Matrix<T>& v) {
v.print(stream);
return stream;
}
#endif
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