npx skills add majiayu000/claude-skill-registry --skill numpy --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# NumPy NumPy is the bedrock of the Python ecosystem. v2.0 (2024) brought the first major ABI change in 15 years, improving performance and API consistency. ## When to Use - **Linear Algebra**: Matrix multiplication, eigenvalues. - **Array Manipulation**: Reshaping, broadcasting. - **Foundation**: When building libraries (like PyTorch or Pandas). ## Core Concepts ### Broadcasting The magic rule that allows `array(3x1) + array(3)` to work. ### Dtypes Precision matters. `float32` vs `float64`. ### Stride Tricks Efficient memory views without copying data. ## Best Practices (2025) **Do**: - **Check v2.0 compat**: Many old libraries broke with NumPy 2.0. - **Use `numpy.strings`**: New string kernels in v2.0 are much faster. **Don't**: - **Don't write `for` loops**: Always vectorize operations. ## References - [NumPy Documentation](https://numpy.org/)
- When to Use
- Core Concepts
- Broadcasting
- Dtypes
- Stride Tricks
- Best Practices (2025)
- References
What does the numpy skill do?
NumPy numerical computing with arrays. Use for numerical operations.
How do I install it?
Run `npx skills add majiayu000/claude-skill-registry --skill numpy --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From majiayu000/claude-skill-registry, a repository with 534 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.