What does .shape[] do in “for i in range(Y.shape[0])”?

Question

I\'m trying to break down a program line by line. Y is a matrix of data but I can\'t find any concrete data on what .shape[0] does exactly.

Answer 1

shape is a tuple that gives dimensions of the array..

>>> c = arange(20).reshape(5,4)
>>> c
array([[ 0,  1,  2,  3],
       [ 4,  5,  6,  7],
       [ 8,  9, 10, 11],
       [12, 13, 14, 15],
       [16, 17, 18, 19]])

c.shape[0] 
5

Gives the number of rows

c.shape[1] 
4

Gives number of columns