public static Dataset <double> Sum(this Dataset <double> src) => src.CalcSum(Dataset.Alloc <double>(src.Dim, 1));
public static Dataset <float> Sum(this Dataset <float> src) => src.CalcSum(Dataset.Alloc <float>(src.Dim, 1));
public static Dataset <double> Sum(this Dataset <double> src) => src.CalcSum(Dataset.Alloc <double>(src.Dim, 1));
public static Dataset <float> Sum(this Dataset <float> src) => src.CalcSum(Dataset.Alloc <float>(src.Dim, 1));