set default parameters for vramp. (#1)

* set default parameters for vramp.

* fixed lint errors.

Author: dastrobu

.gitignore

@@ -1,6 +1,7 @@
 .DS_Store
 /.build
 /Packages
+/DerivedData
 /*.xcodeproj
 
 *.log

AccelerateArray.podspec

@@ -16,7 +16,7 @@ Pod::Spec.new do |s|
   #
 
   s.name         = "AccelerateArray"
-  s.version      = "0.0.1"
+  s.version      = "0.0.2"
   s.summary      = "Swift Array Extensions for the Apple Accelerate Framework"
 
   # This description is used to generate tags and improve search results.

Sources/AccelerateArray/vDSP.swift

@@ -19,7 +19,7 @@ public extension Array where Element == Float {
 
     /// Build ramped vector
     /// https://developer.apple.com/documentation/accelerate/1450369-vdsp_vramp
-    init(start: Element, step: Element, n: Int) {
+    init(start: Element = 0.0, step: Element = 1.0, n: Int) {
         self.init(repeating: 0, count: n)
         var a = start
         var b = step
@@ -114,7 +114,7 @@ public extension Array where Element == Double {
 
     /// Build ramped vector
     /// https://developer.apple.com/documentation/accelerate/1449999-vdsp_vrampd
-    init(start: Element, step: Element, n: Int) {
+    init(start: Element = 0.0, step: Element = 1.0, n: Int) {
         self.init(repeating: 0, count: n)
         var a = start
         var b = step

Tests/AccelerateArrayTests/vDSP.swift

@@ -4,17 +4,27 @@ import XCTest
 class VDSPTests: XCTestCase {
 
     func testVrampFloat() {
+        XCTAssertEqual([Float].init(stop: 2.0), [0.0, 1.0])
         XCTAssertEqual([Float].init(start: 0.0, stop: 1.0, step: 1.0), [0.0])
         XCTAssertEqual([Float].init(start: 0.0, stop: 2.0, step: 1.1), [0.0, 1.1])
         XCTAssertEqual([Float].init(start: -1.0, stop: 2.0, step: 1.0), [-1.0, 0.0, 1.0])
         XCTAssertEqual([Float].init(start: -1.0, stop: -3.0, step: -1.0), [-1.0, -2.0])
+
+        XCTAssertEqual([Float].init(n: 2), [0.0, 1.0])
+        XCTAssertEqual([Float].init(start: 1.0, n: 2), [1.0, 2.0])
+        XCTAssertEqual([Float].init(start: 1.0, step: 2.0, n: 2), [1.0, 3.0])
     }
 
     func testVrampDouble() {
+        XCTAssertEqual([Double].init(stop: 2.0), [0.0, 1.0])
         XCTAssertEqual([Double].init(start: 0.0, stop: 1.0, step: 1.0), [0.0])
         XCTAssertEqual([Double].init(start: 0.0, stop: 2.0, step: 1.1), [0.0, 1.1])
         XCTAssertEqual([Double].init(start: -1.0, stop: 2.0, step: 1.0), [-1.0, 0.0, 1.0])
         XCTAssertEqual([Double].init(start: -1.0, stop: -3.0, step: -1.0), [-1.0, -2.0])
+
+        XCTAssertEqual([Double].init(n: 2), [0.0, 1.0])
+        XCTAssertEqual([Double].init(start: 1.0, n: 2), [1.0, 2.0])
+        XCTAssertEqual([Double].init(start: 1.0, step: 2.0, n: 2), [1.0, 3.0])
     }
 
     func testMtransFloatWhenEmpty() {