[yt-users] Clearing a derived field from all grids

[Matthew Turk]

Hi Elizabeth,

Yes, sorry, I misread 'ng'.  I'll be more explicit -- if you have a
GridPatch object, you can do "del grid[field_name]" and it will remove
it.  One thing you can do is iterate over the grids, as you note, like
this:

for g in pf.h.grids: del g[field_name]

Good luck.

-Matt

On Mon, Dec 12, 2011 at 8:58 PM, Elizabeth Tasker
<tasker at astro1.sci.hokudai.ac.jp> wrote:
> Hi Matt,
>
> Unfortunately, that doesn't work.
>
> I can do:
>
> del ng[n][fieldname]
>
> But then I'd have to recreate the field afresh for each grid (very
> slow), as opposed to just when I rerun the whole loop again:
>
> for c in (nclouds):
>  grids, cis = kd.locate_neighbors_from_position(position)
>  for  n in range(26):
>    phi = grids[n]["EffectivePotential"][cis[n]]
>     del grids[n]["EffectivePotential"]
>
> I really want to delete every c-loop, not every n loop.
>
> Possibly the best way is to loop over the n loop again and delete the
> grids afterwards:
>
> for n in range(26):
> del grids[n]["EffectivePotential"]
>
> Which is fine, I was just checking if there was a neater way!
>
> Elizabeth
>
>
> On 12 December 2011 20:18, Matthew Turk <matthewturk at gmail.com> wrote:
>> Hi Elizabeth,
>>
>> You can do:
>>
>> del ng[fieldname]
>>
>> -Matt
>>
>> On Dec 12, 2011 5:45 AM, "Elizabeth Tasker"
>> <tasker at astro1.sci.hokudai.ac.jp> wrote:
>>>
>>> Hi,
>>>
>>> Is there a way of deleting a single derived field from all grids?
>>>
>>> I seem to be having a problem with my derived field not being
>>> re-calculated for every element in a loop (it needs to be). Therefore,
>>> if I run the complete loop, I get an incorrect result for some of the
>>> elements which are totally fine if I tell the code to just calculate
>>> that element in a single sweep.
>>>
>>> I've tried deleting the individual elements that use that variable,
>>> but it doesn't seem to be enough, e.g.
>>>
>>> ng, nc = kd.locate_neighbors_from_position(nposn)
>>> .
>>> .
>>> .
>>> del ng
>>>
>>>
>>> Elizabeth
>>> _______________________________________________
>>> yt-users mailing list
>>> yt-users at lists.spacepope.org
>>> http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org
>>
>>
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