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Code Matrix

# print matrix in spiral form python

Python program for Spiral traversal of matrix. Here problem description and explanation.

``````#  Python 3 program for
#  Spiral form of matrix
class SpiralView :
def spiral(self, data, startRow,
startCol, endRow, endCol, element) :
i = startCol
#  Left to right
while (i <= endCol and element > 0) :
element -= 1
print("", data[startRow][i], end = " ")
i += 1

i = startRow + 1
#  Top to down
while (i <= endRow and element > 0) :
element -= 1
print("", data[i][endCol], end = " ")
i += 1

i = endCol - 1
#  Bottom right to bottom-left
while (i >= startCol and element > 0) :
element -= 1
print("", data[endRow][i], end = " ")
i -= 1

i = endRow - 1
#  Bottom left to top
while (i > startRow and element > 0) :
element -= 1
print("", data[i][startRow], end = " ")
i -= 1

if (startRow + 1 <= endRow - 1 and element > 0) :
#  Recursive call
self.spiral(data, startRow + 1, startCol + 1,
endRow - 1, endCol - 1, element)

def main() :
task = SpiralView()
#  Given matrix
matrix = [
[1, 2, 3, 4, 5, 6],
[22, 23, 24, 25, 26, 7],
[21, 36, 37, 38, 27, 8],
[20, 35, 42, 39, 28, 9],
[19, 34, 41, 40, 29, 10],
[18, 33, 32, 31, 30, 11],
[17, 16, 15, 14, 13, 12]
]
row = len(matrix)
col = len(matrix[0])
#  Get the number of element
element = row * col
task.spiral(matrix, 0, 0, row - 1, col - 1, element)

if __name__ == "__main__": main()``````

Output

`` 1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42``

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