remove ginext/mongoext (no-dep lib)

mathext/clamp.go

@@ -0,0 +1,41 @@
+package mathext
+
+func ClampInt(v int, lo int, hi int) int {
+	if v < lo {
+		return lo
+	} else if v > hi {
+		return hi
+	} else {
+		return v
+	}
+}
+
+func ClampInt32(v int32, lo int32, hi int32) int32 {
+	if v < lo {
+		return lo
+	} else if v > hi {
+		return hi
+	} else {
+		return v
+	}
+}
+
+func ClampFloat32(v float32, lo float32, hi float32) float32 {
+	if v < lo {
+		return lo
+	} else if v > hi {
+		return hi
+	} else {
+		return v
+	}
+}
+
+func ClampFloat64(v float64, lo float64, hi float64) float64 {
+	if v < lo {
+		return lo
+	} else if v > hi {
+		return hi
+	} else {
+		return v
+	}
+}

mathext/float.go

@@ -0,0 +1,7 @@
+package mathext
+
+import "math"
+
+func Float64EpsilonEq(v1 float64, v2 float64, eps float64) bool {
+	return math.Abs(v1-v2) <= eps
+}

mathext/math.go

@@ -0,0 +1,13 @@
+package mathext
+
+func AvgFloat64(arr []float64) float64 {
+	return SumFloat64(arr) / float64(len(arr))
+}
+
+func SumFloat64(arr []float64) float64 {
+	sum := 0.0
+	for _, v := range arr {
+		sum += v
+	}
+	return sum
+}

mathext/statistics.go

@@ -0,0 +1,41 @@
+package mathext
+
+func Sum(v []float64) float64 {
+	total := float64(0)
+	for _, v := range v {
+		total += v
+	}
+	return total
+}
+
+func Mean(v []float64) float64 {
+	return Sum(v) / float64(len(v))
+}
+
+func Median(v []float64) float64 {
+	if len(v)%2 == 1 {
+		return v[len(v)/2]
+	} else {
+		return (v[len(v)/2-1] + v[len(v)/2]) / float64(2)
+	}
+}
+
+func Min(v []float64) float64 {
+	r := v[0]
+	for _, val := range v {
+		if val < r {
+			r = val
+		}
+	}
+	return r
+}
+
+func Max(v []float64) float64 {
+	r := v[0]
+	for _, val := range v {
+		if val > r {
+			r = val
+		}
+	}
+	return r
+}