title: Conversion of entire array from int to double in order to do some aritmetic operations
body: <p>I have this bit of code:</p>
  
  <pre><code>    var arrayIntegers : [Int] = []
      arrayIntegers += 0...33
      var arrayDecimal : [Int] = []
      arrayDecimal += 0...999
  </code></pre>
  
  <p>The problem is I can´t convert the values of both arrays to Double. What I want to do is to get a new array (called arrayDoubleComposed) with composite values, taking a value of arrayIntegers as the integer part and then taking another value of arrayDecimal as the floating part.</p>
  
  <p>When I try to typecast this:</p>
  
  <pre><code>    var arrayDoubleComposed : [Double] = []
      arrayDoubleComposed = Double (arrayIntegers[] + (arrayDecimal[])/1000)
  </code></pre>
  
  <p>I´ve got an error. The same if I suppress the [].</p>
  
  <p>I´m a little bit newcomer, I know...</p>