replace the NaN value zero after an operation with arrays

Question

hi all, how can I replace the NaN value in an array, zero if an operation is performed such that as a result instead of the NaN value is zero operations as

0 / 0 = NaN can be replaced by 0

Answer 1

If you have Python 2.6 you have the math.isnan() function to find NaN values.

With this we can use a list comprehension to replace the NaN values in a list as follows:

import math
mylist = [0 if math.isnan(x) else x for x in mylist]

If you have Python 2.5 we can use the NaN != NaN trick from this question so you do this:

mylist = [0 if x != x else x for x in mylist]