{"id":16684,"date":"2023-06-05T10:12:20","date_gmt":"2023-06-05T10:12:20","guid":{"rendered":"https:\/\/www.prepbytes.com\/blog\/?p=16684"},"modified":"2023-06-05T10:20:30","modified_gmt":"2023-06-05T10:20:30","slug":"spiral-traversal-of-a-matrix-in-python","status":"publish","type":"post","link":"https:\/\/prepbytes.com\/blog\/spiral-traversal-of-a-matrix-in-python\/","title":{"rendered":"Spiral Traversal Of A Matrix In Python"},"content":{"rendered":"

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The traversal of a matrix is a common operation in many programming tasks. The spiral traversal is a specific traversal pattern in which the elements of the matrix are visited in a spiral-like order, beginning at the top-left corner and moving clockwise until all elements are visited. In this article, we will look at various algorithms and provide Python code examples for the spiral traversal of a matrix.<\/p>\n

What is a matrix spiral traversal?
\nSpiral traversal of a matrix is a method of visiting the elements of a two-dimensional matrix in a spiral-like order, beginning at the top-left corner and moving clockwise until all elements have been visited.<\/p>\n

Example of spiral matrix in Python:
\n\"\"<\/p>\n

The preceding example shows how we can traverse the matrix in a spiral fashion. So, in order to solve this problem, we will primarily discuss four approaches: <\/p>\n

    \n
  1. Iterative procedure<\/li>\n
  2. Recursive strategy<\/li>\n
  3. Using the DFS method<\/li>\n
  4. Using a deque<\/li>\n<\/ol>\n

    Method 1 : Iterative Approach to solve spiral traversal of a matrix in Python<\/h2>\n
      \n
    1. To keep track of the spiral’s boundaries, initialize four variables: top, bottom, left, and right.<\/li>\n
    2. Create an empty list,’result,’ to hold the visited elements.<\/li>\n
    3. Create a while loop that runs until ‘top = bottom’ and ‘left = right’.<\/li>\n
    4. Go through the top row from left to right, appending ‘result’ to each element.<\/li>\n
    5. Increase the value of ‘top’ by one to exclude the top row from future iterations.<\/li>\n
    6. Go down the right column from top to bottom, appending ‘result’ to each element.<\/li>\n
    7. Increase the value of ‘right’ by one to exclude the right column from future iterations.<\/li>\n
    8. Before proceeding, ensure that ‘top = bottom’ and ‘left = right’.<\/li>\n
    9. Go down the bottom row from right to left, appending ‘result’ to each element.<\/li>\n
    10. Increase the value of ‘bottom’ by one to exclude the bottom row from future iterations.<\/li>\n
    11. Traverse the left column from bottom to top, appending each element to result<\/code>.<\/li>\n
    12. Increase ‘left’ by one to remove the left column from subsequent iterations.<\/li>\n
    13. Display the result list.<\/li>\n<\/ol>\n

      Python code for the iterative approach:<\/h3>\n\t\t\t\t\t\t