Border matrix pattern Dry Run in PYTHON

Border matrix pattern is an interactive PYTHON dry run visualizer from the Patterns programs section. Study the source code, then use the execution controls to follow each step, variable update, highlighted line, and console output.

This page provides a browser-based dry run with source-code highlighting, auto-scroll, voice narration controls, and execution output for learning the program step by step.

Border matrix pattern Program Code

n = 4
mat = [[1 if (i == 0 or i == n - 1 or j == 0 or j == n - 1) else 0 for j in range(n)] for i in range(n)]
for row in mat:
    print(row)

View the complete Patterns programs page.