Ignoring -Inf values in arrays using numpy/scipy in Python

Question

I have an NxM array in numpy that I would like to take the log of, and ignore entries that were negative prior to taking the log. When I take the log of negative entries, it

Answer 1

Use a filter():

>>> array
array([  1.,   2.,   3., -Inf])
>>> sum(filter(lambda x: x != float('-inf'), array))
6.0