Question: Matrix Multiplication Why We Need Nested Loops
Written in response to a community member's question about why matrix multiplication requires three nested loops rather than a simpler approach. Explains what a matrix is as a 2D array-of-arrays, walks through the dot-product calculation that each result cell requires, and maps each loop level to a specific role: the outer loop selects rows of the first matrix, the middle loop selects columns of the second, and the inner loop accumulates the element-wise products. Includes a clean Python implementation and a worked 2x2 numeric example.