Python Math: Generate a square matrix filled with elements from 1 to n raised to the power of 2 in spiral order
Python Math: Exercise-73 with Solution
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]]
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Find current directory and file's directory:
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To get the current working directory use
import os cwd = os.getcwd()
Documentation references for the modules, constants and functions used above:
- The os and os.path modules.
- The __file__ constant
- os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
- os.path.dirname(path) (returns "the directory name of pathname path")
- os.getcwd() (returns "a string representing the current working directory")
- os.chdir(path) ("change the current working directory to path")
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