Put xs back before ys

jsbean · jsbean · commit 75c0102bcfb7 · 2016-11-08T21:31:27.000-05:00
diff --git a/Linear Regression/LinearRegression.playground/Contents.swift b/Linear Regression/LinearRegression.playground/Contents.swift
@@ -38,7 +38,7 @@ func multiply(_ a: [Double], _ b: [Double]) -> [Double] {
 }
 
 func linearRegression(_ xs: [Double], _ ys: [Double]) -> (Double) -> Double {
-    let sum1 = average(multiply(ys, xs)) - average(xs) * average(ys)
+    let sum1 = average(multiply(xs, ys)) - average(xs) * average(ys)
     let sum2 = average(multiply(xs, xs)) - pow(average(xs), 2)
     let slope = sum1 / sum2
     let intercept = average(ys) - slope * average(xs)

Original file line number	Diff line number	Diff line change
`@@ -38,7 +38,7 @@ func multiply(_ a: [Double], _ b: [Double]) -> [Double] {`
`38`	`38`	`}`
`39`	`39`
`40`	`40`	`func linearRegression(_ xs: [Double], _ ys: [Double]) -> (Double) -> Double {`
`41`		`- let sum1 = average(multiply(ys, xs)) - average(xs) * average(ys)`
	`41`	`+ let sum1 = average(multiply(xs, ys)) - average(xs) * average(ys)`
`42`	`42`	`let sum2 = average(multiply(xs, xs)) - pow(average(xs), 2)`
`43`	`43`	`let slope = sum1 / sum2`
`44`	`44`	`let intercept = average(ys) - slope * average(xs)`