[Numpy-discussion] Mirror/flip numpy array?

Keith Goodman kwgoodman@gmail....
Fri Jul 17 08:30:36 CDT 2009

On Fri, Jul 17, 2009 at 6:21 AM, Gary Ruben<gruben@bigpond.net.au> wrote:
> In [1]: a=array([1,2,3])
> In [2]: a[::-1]
> Out[2]: array([3, 2, 1])
> Johannes Bauer wrote:
>> Hello list,
>> I have a really simple newbie question: How can I mirror/flip a
>> numpy.ndarray? I.e. mirror switches the colums (leftmost becomes
>> rightmost and so on), flip changes the rows (top becomes bottom and so on)?

There's also np.fliplr (left right) and np.flipud (up down). The last
line of these functions are "return m[:, ::-1]" and "return
m[::-1,...]", respectively.

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