Index error, delete row from array if column has a value

Question

I have a array 'x' with four columns.

For each row if the 4th column has a value of 1 then I want to delete that entire row:

x = np.array([[1,2,3,0],[11,2,3,24],[1,22,3,1],[1,22,3,1], [5,6,7,8], [9,10,11,1]])
for i in range(0,len(x)):
    if x[i][4]==0:
        x=np.delete(x, i,0)

I get the following error:

Traceback (most recent call last):
File "", line 2, in
if x[i][4]==0:
IndexError: index out of bounds

Answer 1

You're trying to reference the fourth column with [4], but since it's zero based it's actually [3]

Answer 2

You can use indexing:

>>> x[x[:,3] != 1]
array([[ 1,  2,  3,  0],
       [11,  2,  3, 24],
       [ 5,  6,  7,  8]])