Matrix interface running time test...
1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/work/alpar/matrix.cc Mon Nov 15 15:05:00 2004 +0000
1.3 @@ -0,0 +1,75 @@
1.4 +#include <lemon/time_measure.h>
1.5 +#include <vector>
1.6 +
1.7 +template<class T>
1.8 +class Matrix
1.9 +{
1.10 +public:
1.11 + int m,n;
1.12 + std::vector<T> values;
1.13 +
1.14 + Matrix(int _m, int _n) : m(_m), n(_n), values(n*m) {}
1.15 + typename std::vector<T>::reference operator()(int i, int j)
1.16 + { return values[i*n+j];}
1.17 +
1.18 + class Row
1.19 + {
1.20 + public:
1.21 + Matrix<T> &mat;
1.22 + int row;
1.23 +
1.24 + Row(Matrix<T> &_mat,int _row) : mat(_mat), row(_row) {}
1.25 + typename std::vector<T>::reference operator()(int j)
1.26 + { return mat.values[row*mat.n+j];}
1.27 + };
1.28 + class Column
1.29 + {
1.30 + public:
1.31 + Matrix<T> &mat;
1.32 + int col;
1.33 +
1.34 + Column(Matrix<T> &_mat,int _col) : mat(_mat), col(_col) {}
1.35 + typename std::vector<T>::reference operator[](int i)
1.36 + { return mat.values[i*mat.n+col];}
1.37 + };
1.38 +
1.39 + Row operator[](int i) { return Row(*this,i); }
1.40 + Column operator()(int j) { return Column(*this,j); }
1.41 +};
1.42 +
1.43 +main()
1.44 +{
1.45 + const int COUNT=1000000;
1.46 + const int SIZE=100;
1.47 +
1.48 + Matrix<int> A(SIZE,SIZE);
1.49 +
1.50 + for(int i=0;i<SIZE;i++) for(int j=0;j<SIZE;j++) A(i,j)=i+j;
1.51 +
1.52 + int s=0;
1.53 + lemon::Timer T;
1.54 + for(int c=0;c<COUNT;c++) {
1.55 + for(int i=0;i<SIZE;i++) for(int j=0;j<SIZE;j++) s+=A[i](j);
1.56 + }
1.57 + std::cout << "A[i](j): " << T << ' ' << s <<'\n';
1.58 + s=0;
1.59 + T.reset();
1.60 + for(int c=0;c<COUNT;c++) {
1.61 + for(int i=0;i<SIZE;i++) for(int j=0;j<SIZE;j++) s+=A(i,j);
1.62 + }
1.63 + std::cout << "A(i,j): " << T << ' ' << s << '\n';
1.64 + s=0;
1.65 + T.reset();
1.66 + for(int c=0;c<COUNT;c++) {
1.67 + for(int i=0;i<SIZE;i++) for(int j=0;j<SIZE;j++) s+=A(j)[i];
1.68 + }
1.69 + std::cout << "A(j)[i]: " << T << ' ' << s << '\n';
1.70 + s=0;
1.71 + T.reset();
1.72 + for(int c=0;c<COUNT;c++) {
1.73 + for(int i=0;i<SIZE;i++) for(int j=0;j<SIZE;j++) s+=A(i,j);
1.74 + }
1.75 + std::cout << "A(j,i): " << T << ' ' << s << "\n\n";
1.76 +
1.77 + return 0;
1.78 +}