josdejong/mathjs

Nested derivatives fail

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#3,528 建立於 2025年9月8日

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 (3 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 mathJs evaluates this derivative correctly: derivative('x * e^x', "x") // returns "e ^ x * (x + 1)"

however, if the expression to be differentiated is involves another derivative mathJs returns an incorrect answer: derivative('x * derivative("e^x", "x")', "x") // returns "e^x"

To Reproduce enter expression in mathJs demo window: derivative('x * derivative("e^x", "x")', "x")

貢獻者指南

技術棧
javascript
領域
data
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。
fresh
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
mostly clear
前置要求
JavaScriptbasic calculus
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
The bug occurs when the derivative function is called inside another derivative expression. Look at the implementation of math.derivative in the source code (likely in src/expression/function/derivative.js). Investigate how nested function calls are parsed and evaluated. The issue may be in how the derivative handles its internal expression scope or symbolic differentiation of derivative calls. Check recent commits or issues for related discussions.
Nested derivatives fail · josdejong/mathjs#3528 | Good First Issue