[Numpy-discussion] checking array for NaN values.

josef.pktd@gmai... josef.pktd@gmai...
Thu Jan 8 20:34:49 CST 2009

On Thu, Jan 8, 2009 at 9:15 PM, Alexandra Geddes <mexicalex@yahoo.com> wrote:
> Is there an easy way to check an array for NaN values?  'all(array)' regards NaN as true (because it's not 0).  I've tried all(array != nan) which didn't work either.  When i call locations which i know are NaN, it returns -1.#IND.  But if i try to call all(array != -1.#IND), python interprets the # as the start of a comment.

I use

>>> np.any(np.isnan(np.array([1,2,np.nan])))


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