import get from 'lodash-es/get.js'
import each from 'lodash-es/each.js'
import size from 'lodash-es/size.js'
import cloneDeep from 'lodash-es/cloneDeep.js'
import isarr from 'wsemi/src/isarr.mjs'
import isp0int from 'wsemi/src/isp0int.mjs'
import cint from 'wsemi/src/cint.mjs'
import arrAverage from './arrAverage.mjs'
/**
* 計算陣列內有效數字之移動平均值
*
* Unit Test: {@link https://github.com/yuda-lyu/w-statistic/blob/master/test/arrMovingAverage.test.js Github}
* @memberOf w-statistic
* @param {Array} arr 輸入陣列,只提取有效數字(或為字串的數字)進行計算
* @param {Object} [opt={}] 輸入設定物件,預設{}
* @param {Integer} [opt.selectCountHalf=2] 輸入上下取點數整數,總取點數為2*selectCountHalf+1,預設2(取5點)
* @returns {Array} 回傳移動平均值陣列
* @example
*
* let arr
*
* arr = ['abc', '-2.5', -2.5, '-1', -1, '-0.1', -0.1, '0', 0, '0.1', 0.1, '1', 1, '2.5', 2.5, 22.5, 'xyz']
* console.log(arrMovingAverage(arr))
* // => [
* // -2.5, -2,
* // -1.75, -1.42,
* // -0.9399999999999998, -0.44000000000000006,
* // -0.24000000000000005, -0.02,
* // 0.02, 0.24,
* // 0.44000000000000006, 0.9400000000000001,
* // 1.42, 5.9,
* // 7.125, 9.166666666666666,
* // 12.5
* // ]
*
* arr = ['abc', '0', 0, '0.1', 0.1, '1', 1, '2.5', 2.5, 22.5, 'xyz']
* console.log(arrMovingAverage(arr, { selectCountHalf: 1 }))
* // => [
* // 0,
* // 0,
* // 0.03333333333333333,
* // 0.06666666666666667,
* // 0.39999999999999997,
* // 0.7000000000000001,
* // 1.5,
* // 2,
* // 9.166666666666666,
* // 12.5,
* // 22.5
* // ]
*
*/
function arrMovingAverage(arr, opt = {}) {
//check
if (!isarr(arr)) {
return []
}
if (size(arr) === 0) {
return []
}
//selectCountHalf
let selectCountHalf = get(opt, 'selectCountHalf')
if (!isp0int(selectCountHalf)) {
selectCountHalf = 2
}
selectCountHalf = cint(selectCountHalf)
//n
let n = size(arr)
//check
if (n === 0) {
return []
}
//rs
let rs = cloneDeep(arr)
//arrAverage
each(arr, (v, k) => {
//kStart, kEnd
let kStart = k - selectCountHalf
kStart = Math.max(kStart, 0)
kStart = Math.min(kStart, n - 1)
let kEnd = Math.max(k + selectCountHalf, 0)
kEnd = Math.max(kEnd, 0)
kEnd = Math.min(kEnd, n - 1)
//arrt
let arrt = []
for (let i = kStart; i <= kEnd; i++) {
arrt.push(arr[i])
}
//arrAverage
let avg = arrAverage(arrt)
// console.log(k, kStart, kEnd, 'arrt', arrt, 'avg', avg)
//save
rs[k] = avg
})
return rs
}
export default arrMovingAverage