package maths

import "math"

func Sum(input Float64Data) (sum float64, err error) {
	if input.Len() == 0 {
		return math.NaN(), EmptyInputErr
	}
	for _, n := range input {
		sum += n
	}
	return sum, nil
}

func CumulativeInt64(a *int64, bs ...int64) *int64 {
	var c int64
	for _, b := range bs {
		c += b
	}
	if a == nil {
		return &c
	}
	*a += c
	return a
}