python - Check if float is close to any float stored in array

Question

I need to check if a given float is close, within a given tolerance, to any float in an array of floats.

import numpy as np

# My float
a = 0.27
# The tolerance
t = 0.01
# Array of floats
arr_f = np.arange(0.05, 0.75, 0.008)

Is there a simple way to do this? Something like if a in arr_f: but allowing for some tolerance in the difference?

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Add

By "allow tolerance" I mean it in the following sense:

for i in arr_f:
    if abs(a - i) <= t:
        print 'float a is in arr_f within tolerance t'
        break

Answer 1

How about using np.isclose?

>>> np.isclose(arr_f, a, atol=0.01).any()
True

np.isclose compares two objects element-wise to see if the values are within a given tolerance (here specified by the keyword argument atol which is the absolute difference between two elements). The function returns a boolean array.