Issue with plot_nodal_displacement

[pmaroneh]

It appears that the method plot_nodal_displacement() can be accessed in two ways:

• Method 1: through mapdl.result.plot_nodal_displacement() of the pyMAPDL reader. In this method, the result number uses a 0-indexing (so the first result set is obtained through mapdl.result.plot_nodal_displacement(0)). I've been able to successfully use this method on a model:
  
  However I understand that the pyMAPDL reader is legacy, so its use is not recommended.
• Method 2: through mapdl.post_processing.plot_nodal_displacement(), which belongs to the pyMAPDL module (not pyMAPDL Reader). I have two issues here:

1. Some examples of the pyMAPDL doc use the method from pyMAPDL reader, which makes it confusing, as these two methods do not take the same arguments. See https://mapdldocs.pyansys.com/user_guide/mapdl_examples.html?highlight=plot_nodal_displacement for reference
2. I've not been able to use this method on the same model shown above:
   

[akaszynski]

I think we should depreciate the usage of pymapdl-reader and then move towards using just PyMAPDL or DPF.

Integration with PyDPF would be great. @rlagha, is there an easy way to dpf installed on Linux on GitHub? Do we have instructions for that?

[CesarRodriguezPereira]

I think we should depreciate the usage of pymapdl-reader and then move towards using just PyMAPDL or DPF.

Just my 2 cents, I think this may be good in the long run, but backwards compatibility might be a bit of a pain then. I'd say that most people that currently use PyMapdl are familiar with using the result = mapdl.result idiom, which returns a type ansys.mapdl.reader.rst.Result, so many of us use pymapdl-reader unknowingly, instead of the postprocessing that's directly embeded within ansys.mapdl-core. Maybe having the result object be part of the core could help in phasing out the use of the reader library.

[akaszynski]

Maybe having the result object be part of the core could help in phasing out the use of the reader library.

Agreed. Ideally the result attribute would be an instance of ansys.dpf.core.model.Model.

[rlagha]

@cbellot000 please could you work with @germa89 on this?
@akaszynski

[germa89]

Closing on favor of #1298