Update playground

Upsurge.playground/Pages/Fast Fourier Transform.xcplaygroundpage/Contents.swift

@@ -1,13 +1,7 @@
 //: ## Fast Fourier Transform
 //: This example shows how to perfrom a Fast Fourier Transform with Upsurge
 import Upsurge
-import XCPlayground
-//: Let's define a function to plot all the values in a `ValueArray` to the timeline. If you don't see the timeline press ⌘⌥⏎
-func plot(values: ValueArray<Double>, title: String) {
-    for value in values {
-        XCPlaygroundPage.currentPage.captureValue(value, withIdentifier: title)
-    }
-}
+import PlaygroundSupport
 //: Start by generating uniformly-spaced x-coordinates
 let count = 64
 let frequency = 4.0
@@ -16,10 +10,13 @@ let x = ValueArray<Double>((0..<count).map({ step * Double($0) * frequency }))
 //: And the sine-wave y-coordinates
 let amplitude = 1.0
 let y = amplitude * sin(x)
-//: Now use the function we defined previously to plot the values
-plot(y, title: "Sine Wave")
+for value in y {
+    value
+}
 //: To compute the Fast Fourier Transform we initialize the `FFT` class with the number of samples
 let fft = FFTDouble(inputLength: x.count)
 //: Then compute power spectral density, which is the magnitudes of the FFT
 let psd = fft.forwardMags(sin(x))
-plot(psd, title: "FFT")
+for value in psd {
+    value
+}

Upsurge.playground/Pages/Vector Operations.xcplaygroundpage/Contents.swift

@@ -8,7 +8,7 @@ let arraySum = sum(array)
 let a: ValueArray<Double> = [1.0, 3.0, 5.0, 7.0]
 let b: ValueArray<Double> = [2.0, 4.0, 6.0, 8.0]
 let c = a + b
-//: You can also perform operation that are unique to `ValueArray`. This is how you would compute the dot product between two arrays
+//: You can also perform operations that are unique to `ValueArray`. This is how you would compute the dot product between two arrays
 let product = a • b
 //: You can also perform operations on parts of an array using the usual slice syntax
 let d = a[0..<2] + b[2..<4]