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Added functions for calculating variance

This commit is contained in:
Vincent Esche 2019-10-01 23:26:47 +02:00
parent e87459e5ae
commit 4b543d8f15
1 changed files with 24 additions and 0 deletions
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24
Sources/Surge/Statistics/Statistics.swift
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@ -210,6 +210,30 @@ public func rmsq<C: UnsafeMemoryAccessible>(_ lhs: C) -> Double where C.Element
return result return result
} }
// MARK: - Variance
/// Computes the variance, a measure of the spread of deviation.
public func variance<L: UnsafeMemoryAccessible>(_ lhs: L) -> Float where L.Element == Float {
return variance(lhs, mean: mean(lhs))
}
/// Computes the variance, a measure of the spread of deviation.
public func variance<L: UnsafeMemoryAccessible>(_ lhs: L) -> Double where L.Element == Double {
return variance(lhs, mean: mean(lhs))
}
/// Computes the variance, a measure of the spread of deviation.
public func variance<L: UnsafeMemoryAccessible>(_ lhs: L, mean: Float) -> Float where L.Element == Float {
let diff = sub(lhs, mean)
return measq(diff)
}
/// Computes the variance, a measure of the spread of deviation.
public func variance<L: UnsafeMemoryAccessible>(_ lhs: L, mean: Double) -> Double where L.Element == Double {
let diff = sub(lhs, mean)
return measq(diff)
}
// MARK: - Standard deviation // MARK: - Standard deviation
/// Computes the standard deviation, a measure of the spread of deviation. /// Computes the standard deviation, a measure of the spread of deviation.