How can i change all the values of a multidimensional array which are greater than zero to 1 in python?

Question

I have a Python numpy array I want to change the values of it.

Here is my array:

[[  0   0   0 ...,   0   0   0]
 [  0   0   0 ...,   0   0   0]
 [  0   0   0 ...,   0   0   0]
 ..., 
 [  0   0   0 ..., 174 152 178]
 [  0   0   0 ..., 193 157 172]
 [  0   0   0 ..., 199 173 166]]

How can I change all values which are greater than 0 to 1?

score 0 · Answer 1 · answered Jul 21 '16 at 09:10

0

Suppose a is a numpy array. Then, you make use of Boolean indexing and do a[a > 0] = 1 to change all values greater than 0 to 1. Take a look at http://docs.scipy.org/doc/numpy/reference/arrays.indexing.html#boolean-array-indexing for more examples.

answered Jul 21 '16 at 09:10

edwinksl

7,005
4
30
36

score 0 · Accepted Answer · answered Jul 21 '16 at 10:16

0

It worked. I did like this:

a=[[0,0,0,0,0]
   [0,0,0,0,0]
   [0,0,34,34,35]
   [0,0,11,34,67]]
a[a>0]=1

answered Jul 21 '16 at 10:16

Shiuli Pervin

125
2
8

How can i change all the values of a multidimensional array which are greater than zero to 1 in python?

2 Answers2