File: cumulative_sum.go

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golang-github-montanaflynn-stats 0.7.1-1
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package stats

// CumulativeSum calculates the cumulative sum of the input slice
func CumulativeSum(input Float64Data) ([]float64, error) {

	if input.Len() == 0 {
		return Float64Data{}, EmptyInput
	}

	cumSum := make([]float64, input.Len())

	for i, val := range input {
		if i == 0 {
			cumSum[i] = val
		} else {
			cumSum[i] = cumSum[i-1] + val
		}
	}

	return cumSum, nil
}