What's a good C++ library for matrix operations

Question

I need to do multiplication on matrices. I\'m looking for a library that can do it fast. I\'m using the Visual C++ 2008 compiler and I have a core i7 860 so if the library i

Answer 1

it can't race with scientific libraries, but with visual c++ it is at hand

#include 
#include 
#pragma comment (lib,"Gdiplus.lib")
using namespace Gdiplus;

int main()
{
    ULONG_PTR gpToken = 0;
    GdiplusStartup(&gpToken, &GdiplusStartupInput(), NULL);
    //lib inited

    Matrix A;
    A.Translate(10,20);

    Matrix B;
    B.Rotate(35.0);

    A.Multiply(&B);
    if (A.IsInvertible())
        A.Invert();
    if (!A.IsIdentity())
        A.RotateAt(120.0, PointF(10,10));

    //getting values
    REAL elements[6];
    A.GetElements(elements);

    //lib stopped
    GdiplusShutdown(gpToken);
    return 0;
}

so with this you can easily take the matrix multiplication obstacle (on Windows)

GdiPlus Matrix Documentation