Hacktoberfest 2026:维护者为十月标记出来的 issue,仍然开放、适合新手。 浏览 Hacktoberfest issue

A trigonometric over a symbolic quadratic with a double root is NaN everywhere

已关闭
#1,879 0 条评论 0 个 reaction 已指派 0 人 在 GitHub 查看

维护者通常 1 天内回复

还没有人认领这个 Issue。

评估

难度
4/5
预计耗时
3-5 天
新手友好度
35/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
活跃
技术栈
csharp
领域
backend

调研方向

The bug is in SolveATrigonometricOfALinearOverAPowerOfALinear, which splits the quadratic over its two roots without checking whether the discriminant is zero. Start there, then reproduce the two inputs from the table with ToEntity().Integrate("x"). Done means the double-root case returns a finite antiderivative that passes the exact check at x = -3/10 and 4/5 with a = 3/2.

由索引模型根据 Issue 内容生成。

描述

A sine or cosine over a quadratic with symbolic coefficients and a double root is answered with an expression whose value is NaN everywhere.

Input 2.5.0 master 7df66948
"sin(x)/(a*x^2 + 2*a*x + a)".ToEntity().Integrate("x") integral(...) 644 characters, NaN at every point
"sin(a + b*x)/((c + d)*x^2 + 2*(c + d)*x + (c + d))".ToEntity().Integrate("x") integral(...) 1,128 characters, NaN at every point

SolveATrigonometricOfALinearOverAPowerOfALinear splits the quadratic over its two roots, (-m ± sqrt(m^2 - 4 l n))/(2 l), without noticing that the discriminant is identically zero. The partial fractions then divide by the difference of two equal roots. The exact check gives NaN at x = −3/10 and 4/5 with a = 3/2. The fix reads a double root as the linear x + m/(2 l) twice.

Part of #718

主要语言
C#
星标
831
派生
79
平均合并
2 小时 17 分钟
30 天内合并 PR
443

环境准备

  • 没有 Dockerfile 或 Docker Compose 文件
  • 没有 Pull Request 模板
  • 阅读贡献指南

从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

ASC-Community/AngouriMath 的其他 Issue

查看 ASC-Community/AngouriMath 的全部 Issue

相似的 Issue

更多 C# Issue

把新 issue 发到你的邮箱

精选适合新手参与的 GitHub issue 摘要。