Question

我有一个数组with和index（day）以及一个值（weight）。我想计算'之间的值'，所以myArray中的所有值都是0.00：

typealias Weights = (Double, Double)

var myArray: [Weights] = [ (0.0 , 25.4) , (1.0 , 0.0), (2.0 , 0.0), (3.0 , 0.0), (4.0 , 0.0), (5.0 , 30.3) , (6.0 , 33.5) , (7.0 , 0.0), (8.0 , 0.0), (9.0 , 51.2) , (10.0 , 0.0), (1q.0 , 0.0), (12.0 , 83.1) , (13.0 , 0.0), (14.0 , 0.0), (15.0 , 0.0), (16.0 , 143.0), (17.0 , 0.0), (18.0 , 0.0), (19.0 , 0.0), (20.0 , 0.0), (21.0 , 238.6) , (22.0 , 0.0), (23.0 , 0.0), (24.0 , 311.7) , (25.0 , 322.8) , (26.0 , 0.0), (27.0 , 0.0), (28.0 , 0.0), (29.0 , 460.9) , (30.0 , 0.0), (31.0 , 520.4), (32.0 , 0.0), (33.0 , 0.0),  (34.0 , 0.0), (35.0 , 642.2) , (36.0 , 694.0) , (37.0 , 0.0), (38.0 , 0.0), (39.0 , 0.0), (40.0 , 0.0), (41.0 , 0.0), (42.0 , 0.0), (43.0 , 988.3) , (44.0 , 1018.4) ]

对于计算，它将类似于：

第5天和第0天之间的值为0.00
30.3 - 25.4 = 4.9
4.9 / 5天=每天0.98

所以myArray的结果是：

[(0.0 , 25.4) , (1.0 , 26.4) , (2.0 , 27.4) , (3.0 , 28.4) , (4.0 , 28.3) , (5.0 , 30.3)... etc

我该如何编码？

Answer 1

我不确定这个问题是否为函数式编程提供了简单的解决方案。只需简单的每个循环。

//: Playground - noun: a place where people can play

import UIKit

var str = "Hello, playground"
typealias Weights = (Double, Double)

var myArray: [Weights] = [ (0.0 , 25.4) , (1.0 , 0.0), (2.0 , 0.0), (3.0 , 0.0), (4.0 , 0.0), (5.0 , 30.3) , (6.0 , 33.5) , (7.0 , 0.0), (8.0 , 0.0), (9.0 , 51.2) , (10.0 , 0.0), (11.0 , 0.0), (12.0 , 83.1) , (13.0 , 0.0), (14.0 , 0.0), (15.0 , 0.0), (16.0 , 143.0), (17.0 , 0.0), (18.0 , 0.0), (19.0 , 0.0), (20.0 , 0.0), (21.0 , 238.6) , (22.0 , 0.0), (23.0 , 0.0), (24.0 , 311.7) , (25.0 , 322.8) , (26.0 , 0.0), (27.0 , 0.0), (28.0 , 0.0), (29.0 , 460.9) , (30.0 , 0.0), (31.0 , 520.4), (32.0 , 0.0), (33.0 , 0.0),  (34.0 , 0.0), (35.0 , 642.2) , (36.0 , 694.0) , (37.0 , 0.0), (38.0 , 0.0), (39.0 , 0.0), (40.0 , 0.0), (41.0 , 0.0), (42.0 , 0.0), (43.0 , 988.3) , (44.0 , 1018.4) ]

print(myArray)
var newArray: [Weights] = []
var nextNonZero = 0
var prevNonZero = nextNonZero
for index in prevNonZero..<myArray.count {
    let weight = myArray[index]
    guard weight.1 == 0 else {
        newArray.append(weight)
        continue
    }
    if index > nextNonZero {
        for innerIndex in index..<myArray.count {
            let innerWeight = myArray[innerIndex]
            let weightParam = innerWeight.1
            if weightParam != 0 {
                prevNonZero = nextNonZero
                nextNonZero = innerIndex
                break
            }
        }
    }
    print(prevNonZero, nextNonZero)
    let prevWeight = myArray[prevNonZero]
    let nextWeight = myArray[nextNonZero]
    let stepsNumber = Double(nextNonZero - prevNonZero)
    let difference = nextWeight.1 - prevWeight.1
    guard stepsNumber != 0 else {
        newArray.append((weight.0 , 0))
        continue
    }
    let step = difference / stepsNumber

    let differenceNumber = Double(index - prevNonZero)
    let differenceValue = step * differenceNumber
    let newValue = prevWeight.1 + differenceValue
    newArray.append((weight.0 , newValue))
}

print(newArray)

填充数组中的值

1 个答案: