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math.go
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math.go
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package godf
import "math"
func standardize(x []interface{}) []float64 {
standardizedData := []float64{}
castedData := []float64{}
for _, v := range x {
casted := v.(float64)
castedData = append(castedData, casted)
}
avg := mean(castedData)
for _, v := range castedData {
result := (v - avg) / std(castedData, avg)
standardizedData = append(standardizedData, result)
}
return standardizedData
}
func std(x []float64, mean float64) float64 {
std := 0.
for _, v := range x {
std += math.Pow(v-mean, 2)
}
return math.Sqrt(std / float64(len(x)))
}
func normalize(x []interface{}) []float64 {
normalizedData := []float64{}
castedData := []float64{}
for _, v := range x {
casted := v.(float64)
castedData = append(castedData, casted)
}
min := min(castedData)
max := max(castedData)
for _, v := range castedData {
result := (v - min) / (max - min)
normalizedData = append(normalizedData, result)
}
return normalizedData
}
func mean(x []float64) float64 {
sum := 0.
for _, v := range x {
sum += v
}
return sum / float64(len(x))
}
func min(x []float64) float64 {
min := math.Inf(1)
for _, v := range x {
if v < min {
min = v
}
}
return min
}
func max(x []float64) float64 {
max := math.Inf(-1)
for _, v := range x {
if v > max {
max = v
}
}
return max
}