[yt-users] slice: quick question

[Britton Smith]

Hi Elizabeth,

I'm not sure this is a part of your confusion, but slice in this context is
a Python native datatype taking a subset of an array.  To see what's going
on, you can do something like this:

import numpy as na
q = na.arange(10)
sl_left = slice(None, -2, None)
sl_right = slice(1, -1, None)
print q[sl_left]
print q[sl_right]

The differences in sl_right for the two hydro methods is correcting for
cell/face-centered issue.

Britton

On Fri, Aug 5, 2011 at 9:52 AM, Elizabeth Tasker <taskere at mcmaster.ca>wrote:

> Hi,
>
> Simple question, I think. In the definition of divV:
>
> http://yt.enzotools.org/doc/**reference/field_list.html#divv<http://yt.enzotools.org/doc/reference/field_list.html#divv>
>
> How is the call for slice working:
>
> sl_left = slice(None,-2,None)
> sl_right = slice(2,None,None)
>
>
> and for Zeus:
>
> sl_left = slice(None,-2,None)
> sl_right = slice(1,-1,None)
>
>
> The documentation says the arguments should be axis & co-ordinate and then
> some options.
>
> I have failed to work out the syntax based on what I know the result must
> be!
>
> Thank you~
>
> Elizabeth
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