Using For Loop Variables to Choose an Array Item in Swift

Question

I have a very simple question that I cannot find the answer to. I am trying to plug an array of x and y values through an equation, and fill an array with the answers. The error in this code is that the arrays don't accept numbers because "error: 'Range' is not convertible to 'Int'". How would I deal with this? This is done with Xcode 6.01 in swift playground. Thanks!

let x = [5.0,2.0,43.0,1.0,5.0]
let y = [62.0,2.0,43.0,1.0,4.0]
var answers=[Double]()
var current:Double = 0

for numbers in [0...4] {
    current = 1800*x[numbers] + 1600*y[numbers]
    answers.append(current)
} 

println(answers)

Martin R · Accepted Answer · 2014-10-08 18:45:50Z

2

A range is simply noted by a ... b or a ..< b (depending on whether the last element is included in the range or not). Therefore

for numbers in [0...4] {

should be

for numbers in 0...4 {

without the square brackets, or better

for numbers in 0 ..< x.count {

answered Oct 8, 2014 at 18:45

Martin R

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