StackGenVis: Alignment of Data, Algorithms, and Models for Stacking Ensemble Learning Using Performance Metrics
https://doi.org/10.1109/TVCG.2020.3030352
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85 lines
2.1 KiB
85 lines
2.1 KiB
type Operator = '+' | '-' | '*' | '/' | '%'
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/**
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* For any precise floating point calculation
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*
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* @export
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* @class Decimal
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*/
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export default class Decimal {
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num: number
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constructor(num: number) {
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this.num = num
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}
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decimal(num2: number, operator: Operator): this {
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const num1 = this.num
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const len1 = this.getDecimalLen(num1)
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const len2 = this.getDecimalLen(num2)
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let base = 0
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switch (operator) {
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case '+':
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base = this.getExponent(len1, len2)
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this.num = (this.safeRoundUp(num1, base) + this.safeRoundUp(num2, base)) / base
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break
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case '-':
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base = this.getExponent(len1, len2)
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this.num = (this.safeRoundUp(num1, base) - this.safeRoundUp(num2, base)) / base
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break
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case '*':
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this.num =
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this.safeRoundUp(
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this.safeRoundUp(num1, this.getExponent(len1)),
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this.safeRoundUp(num2, this.getExponent(len2)),
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) / this.getExponent(len1 + len2)
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break
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case '/':
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base = this.getExponent(len1, len2)
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this.num = this.safeRoundUp(num1, base) / this.safeRoundUp(num2, base)
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break
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case '%':
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base = this.getExponent(len1, len2)
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this.num = (this.safeRoundUp(num1, base) % this.safeRoundUp(num2, base)) / base
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break
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}
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return this
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}
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plus(num2: number) {
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return this.decimal(num2, '+')
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}
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minus(num2: number) {
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return this.decimal(num2, '-')
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}
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multiply(num2: number) {
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return this.decimal(num2, '*')
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}
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divide(num2: number) {
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return this.decimal(num2, '/')
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}
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remainder(num2: number) {
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return this.decimal(num2, '%')
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}
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toNumber(): number {
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return this.num
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}
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private getDecimalLen(num: number): number {
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return (`${num}`.split('.')[1] || '').length
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}
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private getExponent(num1: number, num2?: number): number {
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return Math.pow(10, num2 !== void 0 ? Math.max(num1, num2) : num1)
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}
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// fix: 9999999.99995 * 100000 = 999999999994.9999
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private safeRoundUp(num: number, exponent: number): number {
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return Math.round(num * exponent)
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}
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}
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