[Numpy-discussion] Is there a defined way to "unpad" an array, and if not, should there be?

Stephan Hoyer shoyer at gmail.com
Mon Apr 12 16:28:38 EDT 2021

The easy way to unpad an array is by indexing with slices, e.g., x[20:-4]
to undo a padding of [(20, 4)]. Just be careful about unpadding "zero"
elements on the right hand side, because Python interprets an ending slice
of zero differently -- you need to write something like x[20:] to undo
padding by [(20, 0)].

On Mon, Apr 12, 2021 at 1:15 PM Jeff Gostick <jgostick at gmail.com> wrote:

> I often find myself padding an array to do some processing on it (i.e. to
> avoid edge artifacts), then I need to remove the padding.  I wish there
> was either a built in "unpad" function that accepted the same arguments as
> "pad", or that "pad" accepted negative numbers (e.g [-20, -4] would undo a
> padding of [20, 4]).  This seems like a pretty obvious feature to me so
> maybe I've just missed something, but I have looked through all the open
> and closed issues on github and don't see anything related to this.
> Jeff G
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