picklinge GridFunction Error

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4 years 6 months ago - 4 years 6 months ago #2655 by hvwahl
picklinge GridFunction Error was created by hvwahl
Hi everyone,

im trying to pickle and unpickle GridFunctions in a time dependent problem, in order to restart a computation from the pickled data. However, on writing the data from an unpickled GridFunction into the GridFunction used in the computation
Code:
v1 = GridFunction(V) unpickler = pickle.Unpickler(open("1.dat","rb")) up1, = unpickler.load() v1.vec.data = up1.data
I get the following an error:
Code:
netgen.libngpy._meshing.NgException: Archive error: Polymorphic type ngcomp::S_GridFunction<double> not registered for archive
I have attached an MWE and I on the master branch commit ee5d90c06.

Can anyone help me with this?

Best wishes,
Henry
Attachments:
Last edit: 4 years 6 months ago by hvwahl.
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4 years 6 months ago #2656 by cwinters
Replied by cwinters on topic picklinge GridFunction Error
Hi Henry,

you have to use
Code:
v1.vec.data = up1.vec.data
since you can not write a GridFunction on a Basevector.

If I want to save some data for longer times, I usually save the raw data of the vector (just the values in a list and some information the reconstruct the FESpace). There have been quite a lot changes in the pickling interface which caused me some troubles in the past when loading with a newer NGSolve.

Best,
Christoph
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4 years 6 months ago #2657 by hvwahl
Replied by hvwahl on topic picklinge GridFunction Error
Hi Christoph,

thanks for the quick reply! Sorry I missed that!

Best wishes,
Henry
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4 years 6 months ago #2658 by hvwahl
Replied by hvwahl on topic picklinge GridFunction Error
On a related Note:

I also need to pickle BitArrays. I have implemented this netgen/libsrc/core/python_ngcore_export.cpp , but would it be possible to get this into the source code? What would be the best way to do this?

Best wishes,
Henry
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