AttributeError: 'module' object has no attribute 'percentile'

Question

I use this function to calculate percentile from here:

import numpy as np
a = [12, 3, 45, 0, 45, 47, 109, 1, 0, 3]
np.percentile(a, 25)

But I get this error :

AttributeError: 'module' object has no attribute 'percentile'

I also tried

import numpy.percentile as np

but it didn't I got the same error.

my numpy version is 1.3.0 I tried to upgrade but it seems like it won't I used : [sudo pip install --upgrade scipy][2] but I found that there's no upgrade.

my ubuntu version 9.10

my python version is : 2.6.4

i also tried to go arround the numpy.percentile module and I found this here:

>>> def percentile(N, P):
...     n = int(round(P * len(N) + 0.5))
...     if n > 1:
...         return N[n-2]
...     else:
...         return 0
...
>>> a = [1, 23, 5, 45, 676, 2, 0, 4,3]
>>> a = sorted(a)
>>> a
[0, 1, 2, 3, 5, 4, 23, 45, 676]
#When I call the function using 
>>> percentile(a,0.5)
3

but when I tried to find 0.5 percentile manually I found 5

Can anyone help explain to me why this is happening in any of those cases?

Nathan Villaescusa Nathan Villaescusa · Accepted Answer · 2013-04-16T02:15:20

The percentile function was added in version 1.5.x. You will need to upgrade to at least that version.

Did you try:

sudo pip install numpy==1.7.1 --upgrade

To check which version you are running, start the python console and run:

>>> import numpy
>>> print numpy.__version__

You can also do:

sudo pip freeze | grep numpy

The Ubuntu 9.10 numpy package uses version 1.3.03. It is likely that installing version 1.7.0 vai pip was successful, but your machine is defaulting to the python-numpy version instead. You can remove by running:

sudo apt-get remove python-numpy

AttributeError: 'module' object has no attribute 'percentile'

2 Answers