read the official tutorials listed below:

https://support.scitools.com/support/solutions/folders/70000470852

set the correct und execution path

1. run the und

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/home/caesar/.local/share/understand/bin/linux64/und 

1. create the db and then add the repo to be analyzed in it

   1. Use the und create command to create a new project. Specify the name of the project either with the -db option or as the last parameter. Any settings allowed with the settings command (see page 352) can also be used with create. For example:

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       /home/caesar/.local/share/understand/bin/linux64/und create -db /home/caesar/caesar/Diasplus/dataset_construction/use_understand_to_analyze_call_graph/data/pandas.und -languages python
      

   2. If you have a small number of source files then it may be easiest to just supply their names to the analyzer using the wildcard abilities of your operating system shell. For example:

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       /home/caesar/.local/share/understand/bin/linux64/und -db /home/caesar/caesar/Diasplus/dataset_construction/use_understand_to_analyze_call_graph/data/pandas.und add /home/caesar/caesar/Diasplus/dataset_construction/use_understand_to_analyze_call_graph/data/pandas/pandas
      

2. use the und python interpreter

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    /home/caesar/.local/share/understand/bin/linux64/Python/bin/python3.13
   

   or you can specify the interpreter in the terminal to avoid declare it in the sh file every time

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    alias python="/home/caesar/.local/share/understand/bin/linux64/Python/bin/python3.13"
   

3. refer to the api doc to check how to use api
   1. https://docs.scitools.com/manuals/python/genindex.html