Попробуйте это:
extension Array {
// Use this extension method to get subArray [[1,2,3,4,5], [6,7,8,9,10],...]
func chunk(_ chunkSize: Int) -> [[Element]] {
return stride(from: 0, to: self.count, by: chunkSize).map({ (startIndex) -> [Element] in
let endIndex = (startIndex.advanced(by: chunkSize) > self.count) ? self.count-startIndex : chunkSize
return Array(self[startIndex..<startIndex.advanced(by: endIndex)])
})
}
}
let arr = Array(1...100)
var result: [Double] = []
for subArr in arr.chunk(5) {
result.append(subArr.reduce(0.0) {$0 + Double($1)/Double(subArr.count)}) // Use reduce to calculate avarage of numbers in subarray.
}
result // [3.0, 7.9999999999999991, 13.0, 18.0, 23.0, 28.000000000000004, 33.0, 38.0, 43.0, 48.0, 53.0, 58.0, 63.0, 68.0, 73.0, 78.0, 83.0, 88.0, 93.0, 98.0]
использования это и вычислить средний https://gist.github.com/ericdke/fa262bdece59ff786fcb – xmhafiz
Каков желаемый результат? Массив средних значений? – matt