Module 4 Overview

Module 4 — Aggregations, Statistics & Sorting

Welcome

This module is about turning an array into a number — or a handful of numbers — that summarize it. You’ll learn how to aggregate along a specific axis, locate extremes, sort, and count unique values. By the end you’ll chain all of these together to analyze a small real-flavored dataset.

Learning goals

• Aggregate with sum/mean/std/min/max, controlling direction with axis
• Locate extremes with argmin/argmax and np.unravel_index
• Sort arrays and get an ordering with np.sort / arr.sort() / np.argsort
• Count unique values with np.unique
• Combine these tools to analyze a dataset end to end

Setup — run this first.