josdejong/mathjs

Nested derivatives fail

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#3,528 创建于 2025年9月8日

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 (3 评论) (0 反应) (0 负责人)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")

贡献者指南

技术栈
javascript
领域
data
议题类型
bug
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
1-3 hours
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
fresh
清晰度议题是否清楚说明期望改动、验收标准和下一步。
mostly clear
前置要求
JavaScriptbasic calculus
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
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.