Matrices: The Grid That Holds Your Entire Dataset

Open any spreadsheet you have ever worked with. Rows of data. Columns of features. Every cell a number. That spreadsheet is a matrix. Not metaphorically. Not approximately. When you load that spreadsheet into Python for machine learning, it becomes a NumPy matrix, number for number, row for row. The thing you have been looking at in Excel your whole life is the exact data structure that powers AI. From Vector to Matrix A vector is one row of numbers. import numpy as np student = np . array ([ 85