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what is the significance of this line in matrix: rez = [[m[j][i] for j in range (len(m))] for i in range(len(m[0]))]

m = [[1,2],[3,4],[5,6]] for row in m :     print(row) rez = [[m[j][i] for j in range(len(m))] for i in range(len(m[0]))] print("\n") for row in rez:     print(row)

2nd Feb 2018, 5:42 AM
Tincture
2 ответов
+ 1
I am new to python but I will try 😅 m[j][i] j is from 0 to 2 so it will get all the the elements inside the main matrix i 0 and then one it will take you over the elements inside the inner matrix when you combine them with for you will get all the elements which are numbers 1 2 3 4 5 6
2nd Feb 2018, 5:53 AM
Abdurrahman Abulgasim
Abdurrahman Abulgasim - avatar
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# it is regrouping the values # from the vertical rows. matrix = [[1,2], [3,4], [5,6]] width = len(matrix[0]) height = len(matrix) rez2 = [[matrix[j][i] for j in range(height)] for i in range(width)] print(rez2) # there are alternatives to achieve similar results rotate = [] for i in range(width): new_row = [] for j in range(height): new_row.append(matrix[j][i]) rotate.append(new_row) print(rotate) # or rotate2 = [row for row in list(zip(*matrix))] print(rotate2) https://code.sololearn.com/cAP48uSxCWFp/#py
2nd Feb 2018, 8:38 AM
richard