public static bool EqualTo(this Matrix <double> a, Matrix <double> b)
{
if (a.Dim != b.Dim)
{
throw new InvalidOperationException(String.Format("Cannot compare matrix A={0} and matrix B={1}", a.Dim, b.Dim));
}
bool eq = true;
a.ForeachCoord(crd => eq &= a[crd] == b[crd]);
return(eq);
}