/// <summary>
/// Returns the Frobenius norm of matrix <i>A</i>, which is <i>Sqrt(Sum(A[i,j]<sup>2</sup>))</i>.
/// </summary>
/// <param name="A"></param>
/// <returns></returns>
public static double NormF(DoubleMatrix2D A)
{
if (A.Size == 0)
{
return(0);
}
return(A.Aggregate(HypotFunction(), Cern.Jet.Math.Functions.DoubleFunctions.Identity));
}