josdejong/mathjs

Expression rationalization gets stuck or takes too long (it worked in V9.5.1)

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#3,351 建立於 2025年1月16日

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 (5 留言) (0 反應) (0 負責人)JavaScript (13,832 star) (1,298 fork)batch import
bughelp wanted

描述

Describe the bug Recently, I updated Math.js from version 9.5.1 to the latest version, and an expression rationalization that worked before doesn't work anymore. (see To Reproduce)

To Reproduce

import * as mathjs from 'mathjs';

const aa = mathjs.parse("6285.67^5/(s+6285.67)^5");
const bb = mathjs.rationalize(aa, {}, false); // It gets stuck here

console.log(bb.toString());

貢獻者指南

技術棧
javascript
領域
performance
議題類型
bug
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
1-3 hours
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
active
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
mathjs library usageexpression parsing
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
40
研究方向
Investigate rationalize function in mathjs/src/expression/function/rationalize.js. Compare behavior between versions 9.5.1 and current. Look for changes in simplify or rationalize logic that could cause infinite loop or excessive computation. Examine the parse result for the given expression to see if any recent changes to expression tree processing lead to a hang.