Posts tagged

Loops

Loops in Programming: Repeating with For and While

Explains the two main loop types in Python and when to use each. For loops iterate over sequences or use range() to repeat a fixed number of times. While loops run as long as a condition holds, making them suitable for open-ended repetition where the iteration count isn't known upfront. Covers nested loops for working with 2D data like matrices, and the break and continue statements for fine-grained loop flow control. Practical exercise generates a full multiplication table using nested for loops.

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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.

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