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sympy__sympy-13031

Based on the issue description and hints, I can construct the fix. The problem is clear:

  • Skills
  • AI research
  • 3

What it does and how to use it

A skill that teaches Claude Code to do ai research tasks well. It is packaged knowledge the model uses whenever it is relevant.

  1. Install the skill (command above).
  2. In Claude Code, describe what you need - the skill turns on by itself when the context fits.
  3. No commands to memorize: you talk in plain language and the skill does the rest.

Install (Claude Code)

mkdir -p .claude/skills/sympy-sympy-13031 && curl -fsSL https://doutorai.pt/data/lib/skills__sympy-sympy-13031.md -o .claude/skills/sympy-sympy-13031/SKILL.md

Paste this command into the terminal, in your project folder, and the component installs automatically.

Content

Based on the issue description and hints, I can construct the fix. The problem is clear:

1. `SparseMatrix` implements `col_join` directly instead of `_eval_col_join`
2. `hstack` calls `col_join` which in `SparseMatrix` doesn't properly handle zero-row matrices
3. The fix that worked for dense `Matrix` needs to be applied to `SparseMatrix` - implement `_eval_col_join` and `_eval_row_join` methods

Looking at how the fix worked for dense matrices and the hints provided, the fix should add `_eval_col_join` and `_eval_row_join` methods to `SparseMatrix` that properly preserve dimensions when deal

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