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Refactored `func std` based on `func variance`

This commit is contained in:
Vincent Esche 2019-10-01 23:27:56 +02:00
parent 4b543d8f15
commit 47393dae7f
1 changed files with 12 additions and 6 deletions
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18
Sources/Surge/Statistics/Statistics.swift
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@ -238,16 +238,22 @@ public func variance<L: UnsafeMemoryAccessible>(_ lhs: L, mean: Double) -> Doubl
/// Computes the standard deviation, a measure of the spread of deviation.
public func std<L: UnsafeMemoryAccessible>(_ lhs: L) -> Float where L.Element == Float {
let diff = lhs - mean(lhs)
let variance = measq(diff)
return sqrt(variance)
return sqrt(variance(lhs))
}
/// Computes the standard deviation, a measure of the spread of deviation.
public func std<L: UnsafeMemoryAccessible>(_ lhs: L) -> Double where L.Element == Double {
let diff = lhs - mean(lhs)
let variance = measq(diff)
return sqrt(variance)
return sqrt(variance(lhs))
}
/// Computes the standard deviation, a measure of the spread of deviation.
public func std<L: UnsafeMemoryAccessible>(_ lhs: L, mean: Float) -> Float where L.Element == Float {
return sqrt(variance(lhs, mean: mean))
}
/// Computes the standard deviation, a measure of the spread of deviation.
public func std<L: UnsafeMemoryAccessible>(_ lhs: L, mean: Double) -> Double where L.Element == Double {
return sqrt(variance(lhs, mean: mean))
}
// MARK: - Linear regression