[yt-users] slice: quick question

[Elizabeth Tasker]

Hi Britton,

Ah, right -- I was thinking it was a call of AMRSliceBase. That helps a 
lot, thanks.

Elizabeth



Britton Smith wrote:
> 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 
> <mailto: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
>
>     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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