package koboldsim

import "math"

// Generic helper functions not directly attached to Card Sim Engine mechanics.

// Mean calculates the mathematical mean of its arguments (the sum, divided
// by the number of elements). If it is called with no arguments, it returns
// NaN ("not a number"). If there are contradictory infinities among the
// arguments, it also returns NaN. Overflowing or underflowing can create an
// infinity.
func Mean(vals ...float64) float64 {
	if len(vals) == 0 {
		return math.NaN()
	}

	total := 0.0
	for _, x := range vals {
		total += x
	}
	return total / float64(len(vals))
}