X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Flinal%2Fmatrix.h;h=2711d40a637489c1bfa3cc9676c2fb8043f978d4;hb=9ab061034720c1c0db4e8bff5dae4191ccd2a26f;hp=929c48247e517aa47d837df1438c94465e25064a;hpb=ffb043ce670d733decc03c6e4240a4e6d980caec;p=libs%2Fmath.git

diff --git a/source/linal/matrix.h b/source/linal/matrix.h
index 929c482..2711d40 100644
--- a/source/linal/matrix.h
+++ b/source/linal/matrix.h
@@ -2,6 +2,7 @@
 #define MSP_LINAL_MATRIX_H_
 
 #include <algorithm>
+#include <ostream>
 #include "vector.h"
 
 namespace Msp {
@@ -13,6 +14,9 @@ A general mathematical matrix with M rows and N columns.
 template<typename T, unsigned M, unsigned N>
 class Matrix
 {
+public:
+	typedef T ElementType;
+
 private:
 	T data[M*N];
 
@@ -25,11 +29,20 @@ public:
 	static Matrix from_columns(const Vector<T, M> *);
 	static Matrix from_rows(const Vector<T, N> *);
 
+	unsigned rows() const { return M; }
+	unsigned columns() const { return N; }
+
 	T &element(unsigned i, unsigned j) { return data[i+M*j]; }
 	const T &element(unsigned i, unsigned j) const { return data[i+M*j]; }
 	T &operator()(unsigned i, unsigned j) { return element(i, j); }
 	const T &operator()(unsigned i, unsigned j) const { return element(i, j); }
 
+	Vector<T, M> column(unsigned i) const { return Vector<T, M>(data+M*i); }
+	Vector<T, N> row(unsigned i) const { return Vector<T, N>(data+i, M); }
+
+	template<unsigned P, unsigned Q>
+	Matrix<T, P, Q> select(const Vector<unsigned, P> &, const Vector<unsigned, Q> &) const;
+
 	template<unsigned P, unsigned Q>
 	Matrix<T, P, Q> block(unsigned, unsigned) const;
 
@@ -84,6 +97,17 @@ inline Matrix<T, M, N> Matrix<T, M, N>::from_rows(const Vector<T, N> *v)
 	return m;
 }
 
+template<typename T, unsigned M, unsigned N>
+template<unsigned P, unsigned Q>
+inline Matrix<T, P, Q> Matrix<T, M, N>::select(const Vector<unsigned, P> &row_indices, const Vector<unsigned, Q> &col_indices) const
+{
+	Matrix<T, P, Q> r;
+	for(unsigned j=0; j<P; ++j)
+		for(unsigned i=0; i<Q; ++i)
+			r(j, i) = element(row_indices[j], col_indices[i]);
+	return r;
+}
+
 template<typename T, unsigned M, unsigned N>
 template<unsigned P, unsigned Q>
 inline Matrix<T, P, Q> Matrix<T, M, N>::block(unsigned y, unsigned x) const
@@ -237,6 +261,27 @@ inline Matrix<T, N, M> transpose(const Matrix<T, M, N> &m)
 	return r;
 }
 
+template<typename T, unsigned M, unsigned N>
+inline std::ostream &operator<<(std::ostream &s, const Matrix<T, M, N> &m)
+{
+	s << "Matrix" << M << 'x' << N << '(';
+	for(unsigned i=0; i<N; ++i)
+	{
+		if(i)
+			s << ", ";
+		s << '[';
+		for(unsigned j=0; j<M; ++j)
+		{
+			if(j)
+				s << ", ";
+			s << m(j, i);
+		}
+		s << ']';
+	}
+	s << ')';
+	return s;
+}
+
 } // namespace LinAl
 } // namespace Msp