Is there a faster pythonic way of incrementing part of an array?

Question

I have an array of the form (just an example):

array([[ 14.,  48.],
       [ 18.,  45.],
       [  9.,  42.],
       [  9.,  57.],
       [  3.,  30.]])

And I want to increment by 1 the first component of all the elements to get this:

array([[ 15.,  48.],
       [ 19.,  45.],
       [ 10.,  42.],
       [ 10.,  57.],
       [  4.,  30.]])

Right now, I am using this to do so:

arr = np.array([arr.T[0] + 1, arr.T[1]]).T

But I was wondering if there was a better way to manipulate subarrays like this. Is there?

Answer 1

arr = array([[ 14.,  48.],
   [ 18.,  45.],
   [  9.,  42.],
   [  9.,  57.],
   [  3.,  30.]])
arr[:,0] += 1

if you need a copy, copy the array first with arr.copy().