template<typename T, unsigned M, unsigned N>
class Matrix
{
+public:
+ typedef T ElementType;
+
private:
T data[M*N];
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); }
+ 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;
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> &rows, const Vector<unsigned, Q> &cols) const
+{
+ Matrix<T, P, Q> r;
+ for(unsigned j=0; j<P; ++j)
+ for(unsigned i=0; i<Q; ++i)
+ r(j, i) = element(rows[j], cols[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