Python Math: Generate a square matrix filled with elements from 1 to n raised to the power of 2 in spiral order

Last update on April 24 2025 12:34:53 (UTC/GMT +8 hours)

73. Spiral Matrix Generator

Write a Python program to generate (given an integer n) a square matrix filled with elements from 1 to n raised to the power of 2 in spiral order.

Sample Solution:

Python Code:

#https://gist.github.com/Ray1988/6806c1b85af70388a277
def generateMatrix(n):
        if n<=0:
            return [] 

        matrix=[row[:] for row in [[0]*n]*n]
        
        row_st=0
        row_ed=n-1
        
        col_st=0
        col_ed=n-1
        current=1
        
        while (True):
            if current>n*n:
                break
            for c in range (col_st, col_ed+1):
                matrix[row_st][c]=current
                current+=1
            row_st+=1
            for r in range (row_st, row_ed+1):
                matrix[r][col_ed]=current
                current+=1
            col_ed-=1
            for c in range (col_ed, col_st-1, -1):
                matrix[row_ed][c]=current
                current+=1
            row_ed-=1
            for r in range (row_ed, row_st-1, -1):
                matrix[r][col_st]=current
                current+=1
            col_st+=1
        return matrix

print(list(generateMatrix(3)))

Sample Output:

[[1, 2, 3], [8, 9, 4], [7, 6, 5]] 

Pictorial Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to generate an n x n matrix filled with consecutive numbers in spiral order and print the matrix.
• Write a Python function that takes an integer n and returns a spiral matrix with elements from 1 to n² arranged in spiral order.
• Write a Python script to generate a spiral matrix and then rotate it 90 degrees clockwise before printing.
• Write a Python program to generate a spiral matrix of order 4 and compare the output with a manually constructed matrix.

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Python Code Editor:

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