Finding if a number falls within a certain range python

Question

I'm trying to categorize numbers into "bins" so if a bin is all numbers in the range 0 to 20, then 19 falls into that bin.

I'm trying to do this without using a bunch of if-then states like so:

if x < 0.5:
    return "bin1"
elif x < 0.8:
    return "bin2"
...

Numpy has a numpy.linspace method that generates a numpy array with evenly spaced bins. However, I still don't see how to do this bin categorization efficiently without taking the results of the array and putting them in "if" statements. Thanks.

Are your bins contiguous and do they all have the same width? — Warren Weckesser
– Warren Weckesser, Commented Nov 30, 2013 at 21:02

Ignacio Vazquez-Abrams · Accepted Answer · 2013-11-30 20:18:59Z

6

import bisect

bins = range(0, 100, 15)

print bisect.bisect_left(bins, 35)

answered Nov 30, 2013 at 20:18

Ignacio Vazquez-Abrams

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Bi Rico · Accepted Answer · 2013-11-30 21:06:59Z

3

You can use numpy.searchsorted:

>>> import numpy as np    

>>> bins = np.array([0, 10, 100, 1000])
>>> numbers = np.array([800, 8, 80])
>>> print bins.searchsorted(numbers)
[3, 1, 2]

answered Nov 30, 2013 at 21:06

Bi Rico

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