How to get Coordinate System information from a results file (file.rst) by using DPF?

RvdH
RvdH Member Posts: 12
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in Structures

I want to see which coordinate systems are defined in a Mechanical results file (file.rst). The Programmers Reference mentions that this information is available on the rst file. I can only find a function that retrieves information when the number of the coordinate system is given: op = dpf.operators.result.coordinate_system(). It would be nice if a list with available CS id's could be retrieved. Does a command exist to retrieve that info?
If it's not possible to get the numbers of the defined coordinate systems a try/except statement can be used. I have written the code and found that for non existing CS numbers the exception is raised, but for existing CS numbers I get the following error for all CS ids except for coordinate system id=1:
Unable to describe object with error: invalid vector subscript
An attached file shows the cslist output from APDL.

from ansys.dpf import core as dpf 

path_to_rst = r"<some directory>\file.rst"
print('Datasources: ')
my_data_sources = dpf.DataSources(path_to_rst)
print('my_data_sources: '+str(my_data_sources))

myServer=dpf.start_local_server(ansys_path=r'C:\Program Files\ANSYS Inc\v231')
print('myServer: '+str(myServer))
print("Local server: "+str(myServer.local_server))

for i in range(0,15):
    print(i)
    try:
        op = dpf.operators.result.coordinate_system() # operator instantiation
        op.inputs.cs_id.connect(i)
        op.inputs.data_sources.connect(my_data_sources)
        my_field = op.outputs.field()
        print(my_field)
    except: 
        print('An error occurred')

Best Answer

  • Pierre Thieffry
    Pierre Thieffry Member, Moderator, Employee Posts: 107
    25 Answers Second Anniversary 10 Comments 25 Likes
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    Answer ✓

    @RvdH unfortunately, there is no such operators in dpf. Of course, you could use pyMAPDL to retrieve that information and then use it in your script.

    May I suggest to create an issue on Github to request such a capability?

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