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// Copyright 2023 LiveKit, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package utils
import (
"math"
"golang.org/x/exp/constraints"
)
func LogisticFunc(x0, L, k float64) func(x float64) float64 {
return func(x float64) float64 {
return L / (1 + math.Exp(-k*(x-x0)))
}
}
func FastLogisticFunc(x0, L, k float64) func(x float64) float64 {
return func(x float64) float64 {
return L / 2 * (1 + k*(x-x0)/(1+math.Abs(k*(x-x0))))
}
}
func Abs[T constraints.Signed | constraints.Float](v T) T {
return max(v, -v)
}