[yt-users] Pickling YT objects

[Sam Geen]

Thanks John, I'll give that a go. Sam

On 14/02/2014 15:43, John Wise wrote:
> Hi Sam,
>
> You could try saving the projections to disk by turning on 
> serialization.  This was on by default before last summer.  You can 
> see the email where it was turned off here.
>
> http://lists.spacepope.org/pipermail/yt-users-spacepope.org/2013-July/003824.html 
>
>
> You can also save multiple types of projections, i.e. different 
> regions if you're not doing a full projection, by running
>
> name='test'
> prj = yt.mods.ProjectionPlot(pf, 2, var, center=[0.5, 0.5, 0.5],
>                       width=(rlim, 'pc'), weight_field=None,
>                       field_parameters={'node-name':name})
>
> I save my projections to disk for large simulations where 
> recalculating them is troublesome and time consuming.  However, you 
> can read about the drawbacks in the original email linked above.
>
> Cheers,
> John
>
> On 02/14/2014 09:22 AM, Sam Geen wrote:
>> Hmm, just found this:
>> http://yt-project.org/doc/analyzing/objects.html?#storing-and-loading-objects 
>>
>> although it claims that cPickle should work as well (I have a library
>> that handles the pickling so I'd prefer the cPickle solution if possible
>> to avoid complicating the code)
>>
>> I should add that I'm using a RAMSES gas-only simulation.
>>
>> Sam
>>
>> On 14/02/2014 15:19, Sam Geen wrote:
>>> Hi,
>>>
>>> I'm making plots of my data and I want to save them as pickle files so
>>> I can load them later and perhaps mess with the colour map limits,
>>> say, without reprocessing all the data (I have about 9TB to go
>>> through). When I tried this I got the error: "TypeError: can't pickle
>>> instancemethod objects"
>>>
>>> Do you know if this is possible, or some variant of it? I'm running:
>>>
>>>     pf = yt.mods.load(file_location)
>>>     prj = yt.mods.ProjectionPlot(pf, 2, var, center=[0.5, 0.5, 0.5],
>>>                      width=(rlim, 'pc'), weight_field=None)
>>>
>>> and trying to pickle prj, when I get the error. prj appears to be a
>>> yt.visualization.plot_window.ProjectionPlot object and not an instance
>>> method, but I could be wrong.
>>>
>>> At least it could be good to save the 2D image array and link it back
>>> later to a YT plot object, but I don't know much about the internal
>>> workings of the plot objects as to whether this is possible or not.
>>>
>>> Thanks,
>>>
>>> Sam
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>>
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