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// g++ -O3 -DNDEBUG benchmarkX.cpp -o benchmarkX && time ./benchmarkX
#include <Eigen/Core>
using namespace std;
USING_PART_OF_NAMESPACE_EIGEN
#ifndef MATTYPE
#define MATTYPE MatrixXLd
#endif
#ifndef MATSIZE
#define MATSIZE 400
#endif
#ifndef REPEAT
#define REPEAT 10000
#endif
int main(int argc, char *argv[])
{
MATTYPE I = MATTYPE::ones(MATSIZE,MATSIZE);
MATTYPE m(MATSIZE,MATSIZE);
for(int i = 0; i < MATSIZE; i++) for(int j = 0; j < MATSIZE; j++)
{
m(i,j) = 0.1 * (i+j+1)/(MATSIZE*MATSIZE);
}
for(int a = 0; a < REPEAT; a++)
{
m = I + 0.00005 * (m + m/4);
}
cout << m(0,0) << endl;
return 0;
}
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