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jacob0_dot: docstring errors, and analytic-representation path is a numerical Hessian

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@paneendrakumar0 已经在做这个了。

开始于 2026年10月11日。

  • #737 来自 @paneendrakumar0 —— 未关闭

评估

难度
4/5
预计耗时
3-5 天
新手友好度
25/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
停滞
技术栈
python
领域
backend, documentation, robotics

调研方向

Start with src/roboticstoolbox/robot/Robot.py and inspect Robot.jacob0_dot, its overloads, and the representation= path through jacob0_analytical and smb.numhess. Review the method's tests and documentation examples before deciding how to handle the ignored J0, q=None, and commented derivation. Done means the behavior and docstring agree, the reported edge case is resolved, and the documented example and tests reflect the result.

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描述

tech-debt

Robot.jacob0_dot (src/roboticstoolbox/robot/Robot.py) has a weak docstring, and the representation= path behaves differently from what the docstring implies.

Docstring

  • Text says robot.jacob_dot(q, qd); the method is jacob0_dot
  • Typo: "to to save computation time"
  • No shape info: add :type J0: ndarray(6,n) and :rtype: ndarray(6,n)
  • q=None (allowed by the overload when J0 is given) is undocumented
  • See Also / -------- heading is NumPy style; should be .. seealso::
  • References bullet continuation is mis-indented (likely renders as a block quote)
  • Summary line "Derivative of Jacobian" should say it is the time derivative, in frame {0}
  • No .. runblock:: pycon example

Behaviour behind the docstring

  • With representation set, the result comes from smb.numhess of jacob0_analytical (a numerical Hessian), not the analytic Hessian mode-3 product the docstring describes. It is slower and approximate; this should be stated.
  • On that path J0 is ignored and q=None fails (jacob0_analytical(None)). Either raise a clear error or support it.
  • About 15 lines of commented-out closed-form derivation in the body, with the note "not actually sure this can be written in closed form". Decide: derive and implement it, or delete the comments and record the open question here.

History

Last touched by repo-wide sweeps only (2026-06-30 type-hint/docstring modernisation, 2026-05-19 Sphinx cleanup); never reviewed on its own.

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环境准备

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。

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