  - Sine: Supports amplitude, phase shift, vertical shift, and period.
  - Cosine: Same as sine, but with the cosine function.
  
- Because I haven't worked out how to use Swift's `for x in x1...x2` with CGFloats, I use a where loop, 
- manually incrementing by our interval on each iteration. When the computation for an equation is finished, 
+ Because I haven't worked out how to use Swift's `for x in x1...x2` with CGFloats, I use a where loop,
+ manually incrementing by our interval on each iteration. When the computation for an equation is finished,
  I assign the collected values to the equation's `coordinates` property. The GraphView knows what to do with that.
  
  Also, the GraphView asks the Equations to compute as necessary, so you don't usually need to call this yourself.
  
  */
 
-//: Parabola
+//: Exponential
 
 class Exponential : GraphableEquation
 {
     var exponent : CGFloat = 0.0
-   
+    
     // MARK: - Initializers
     
     init(exponent: CGFloat)

    // MARK: - Draw a Circle
    
    func drawCircle(inContext context: CGContext, atCoordinate coordinate: Coordinate)

    {
        CGContextAddArc(context, coordinate.x, coordinate.y, 1.0, 0.0, CGFloat(M_PI) * 2.0, 0)
    }
}

/*: 
 
 # Defining Some Equations

 Here are some sample implementations of equations.
 
 - Exponential Function: Takes an exponent and calculates a simple x = y^n, where n is user supplied.

    func reflect(overXAxis: Bool, overYAxis: Bool)
    
    func translate(deltaX: CGFloat, deltaY: CGFloat)
    
    func rotate(withAngle theta: CGFloat)
}

