Bug located in ls dyna example

[kmahajan-cadfem]

Before submitting the issue

• I have checked for Compatibility issues
• I have searched among the existing issues
• I am using a Python virtual environment

Description of the bug

I wanted to read the ls dyna results, and tried to run example from
https://dpf.docs.pyansys.com/version/stable/examples/01-transient_analyses/02-lsdyna_operators.html#

but it gives out error

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
~\AppData\Local\Temp\ipykernel_8328\2986215073.py in <module>
     42 
     43 sargs = dict(title="N", fmt="%.2e", title_font_size=30, label_font_size=20)
---> 44 N[0].plot(deform_by=u[0], scalar_bar_args=sargs)
     45 
     46 ###############################################################################

d:\users\mkanchan\pyansys_venvs\mytest\lib\site-packages\ansys\dpf\core\field.py in plot(self, shell_layers, deform_by, scale_factor, **kwargs)
    484             scale_factor=scale_factor,
    485             show_axes=kwargs.pop("show_axes", True),
--> 486             **kwargs,
    487         )
    488 

d:\users\mkanchan\pyansys_venvs\mytest\lib\site-packages\ansys\dpf\core\plotter.py in plot_contour(self, field_or_fields_container, shell_layers, meshed_region, deform_by, scale_factor, **kwargs)
    832 
    833         for field in fields_container:
--> 834             ind, mask = mesh_location.map_scoping(field.scoping)
    835             overall_data[ind] = field.data[mask]
    836 

d:\users\mkanchan\pyansys_venvs\mytest\lib\site-packages\ansys\dpf\core\elements.py in map_scoping(self, external_scope)
    661         if external_scope.location in ["Nodal", "NodalElemental"]:
    662             raise ValueError('Input scope location must be "Nodal"')
--> 663         arr = np.array(list(map(self.mapping_id_to_index.get, external_scope.ids)))
    664         mask = arr != None
    665         ind = arr[mask].astype(np.int32)

d:\users\mkanchan\pyansys_venvs\mytest\lib\site-packages\ansys\dpf\core\elements.py in mapping_id_to_index(self)
    625         """
    626         if self._mapping_id_to_index is None:
--> 627             self._mapping_id_to_index = self._build_mapping_id_to_index()
    628         return self._mapping_id_to_index
    629 

d:\users\mkanchan\pyansys_venvs\mytest\lib\site-packages\ansys\dpf\core\elements.py in _build_mapping_id_to_index(self)
    606     def _build_mapping_id_to_index(self):
    607         """Retrieve the mapping between the IDs and indices of the entity."""
--> 608         return {eid: i for i, eid in enumerate(self.scoping.ids)}
    609 
    610     @property

AttributeError: 'NoneType' object has no attribute 'ids'

Steps To Reproduce

• create virtual env with latest ansys-dpf-core
• download example
• execute all cells

Which Operating System are you using?

Windows

Which DPF/Ansys version are you using?

DPF Server as standalone

Which Python version are you using?

3.7

Installed packages

Package Version

---

aiofiles 22.1.0
aiosqlite 0.18.0
ansys-api-mapdl 0.5.1
ansys-api-platform-instancemanagement 1.0.0b3
ansys-corba 0.1.0
ansys-dpf-core 0.7.4
ansys-dpf-gate 0.3.0
ansys-dpf-gatebin 0.3.0
ansys-dpf-post 0.2.5
ansys-grpc-dpf 0.7.0
ansys-grpc-mapdl 0.4.0
ansys-mapdl-core 0.64.0
ansys-mapdl-reader 0.52.8
ansys-platform-instancemanagement 1.0.3
anyio 3.6.2
appdirs 1.4.4
argon2-cffi 21.3.0
argon2-cffi-bindings 21.2.0
arrow 1.2.3
attrs 22.2.0
Babel 2.11.0
backcall 0.2.0
beautifulsoup4 4.11.2
black 23.1.0
bleach 6.0.0
cached-property 1.5.2
cachetools 5.3.0
certifi 2022.12.7
cffi 1.15.1
charset-normalizer 3.0.1
click 8.1.3
colorama 0.4.6
cycler 0.11.0
debugpy 1.6.6
decorator 5.1.1
defusedxml 0.7.1
entrypoints 0.4
fastjsonschema 2.16.2
fonttools 4.38.0
fqdn 1.5.1
geomdl 5.3.1
google-api-core 2.11.0
google-api-python-client 2.76.0
google-auth 2.16.0
google-auth-httplib2 0.1.0
googleapis-common-protos 1.58.0
grpcio 1.51.1
httplib2 0.21.0
idna 3.4
imageio 2.25.0
importlib-metadata 6.0.0
importlib-resources 5.10.2
ipykernel 6.16.2
ipython 7.34.0
ipython-genutils 0.2.0
ipywidgets 8.0.4
isoduration 20.11.0
jedi 0.18.2
Jinja2 3.1.2
json5 0.9.11
jsonpointer 2.3
jsonschema 4.17.3
jupyter 1.0.0
jupyter_client 7.4.9
jupyter-console 6.4.4
jupyter_core 4.12.0
jupyter-events 0.5.0
jupyter-server 1.23.5
jupyter_server_fileid 0.6.0
jupyter_server_ydoc 0.6.1
jupyter-ydoc 0.2.2
jupyterlab 3.6.0
jupyterlab-pygments 0.2.2
jupyterlab_server 2.19.0
jupyterlab-widgets 3.0.5
kiwisolver 1.4.4
MarkupSafe 2.1.2
matplotlib 3.5.3
matplotlib-inline 0.1.6
mistune 2.0.4
mypy-extensions 0.4.3
nbclassic 0.5.1
nbclient 0.7.2
nbconvert 7.2.9
nbformat 5.7.3
nest-asyncio 1.5.6
notebook 6.5.2
notebook_shim 0.2.2
numpy 1.21.6
packaging 23.0
pandocfilters 1.5.0
parso 0.8.3
pathspec 0.11.0
pickleshare 0.7.5
Pillow 9.4.0
pip 23.0
pkgutil_resolve_name 1.3.10
platformdirs 2.6.2
pooch 1.6.0
prometheus-client 0.16.0
prompt-toolkit 3.0.36
protobuf 3.20.3
protoc-gen-swagger 0.1.0
psutil 5.9.4
pyansys-tools-versioning 0.3.3
pyasn1 0.4.8
pyasn1-modules 0.2.8
pycparser 2.21
Pygments 2.14.0
pyiges 0.2.1
pyparsing 3.0.9
pyrsistent 0.19.3
python-dateutil 2.8.2
python-json-logger 2.0.4
pytz 2022.7.1
pyvista 0.38.1
pywin32 305
pywinpty 2.0.10
PyYAML 6.0
pyzmq 25.0.0
qtconsole 5.4.0
QtPy 2.3.0
requests 2.28.2
rfc3339-validator 0.1.4
rfc3986-validator 0.1.1
rsa 4.9
scipy 1.7.3
scooby 0.7.1
Send2Trash 1.8.0
setuptools 47.1.0
six 1.16.0
sniffio 1.3.0
soupsieve 2.3.2.post1
terminado 0.17.1
tinycss2 1.2.1
tomli 2.0.1
tornado 6.2
tqdm 4.64.1
traitlets 5.9.0
typed-ast 1.5.4
typing_extensions 4.4.0
uri-template 1.2.0
uritemplate 4.1.1
urllib3 1.26.14
vtk 9.2.5
wcwidth 0.2.6
webcolors 1.12
webencodings 0.5.1
websocket-client 1.5.0
widgetsnbextension 4.0.5
y-py 0.5.5
ypy-websocket 0.8.2
zipp 3.12.0

[PProfizi]

Hi @kmahajan-cadfem,

I noticed you wrote DPF as standalone as DPF/Ansys version you are running, however the result of your pip list command tells me that is not the case.
If that were the case, tou would have something like this:

Could you please add this line in the example right after the imports and report the number printed:
print(dpf.server._global_server().version)

[kmahajan-cadfem]

Hi @PProfizi.
Thank you for pointing this out, following is the output of the version

print(dpf.server._global_server().version)
>>> 5.0

[PProfizi]

Hi @kmahajan-cadfem,
So this tells me that you are indeed using Ansys 2023R1 instead of the standalone DPF package ansys-dpf-server-2023-2-pre0.
I think this issue is solved in our latest DPF server version. Would it be possible for you to use this documentation to try and see if the bug persists with the standalone DPF server?

[kmahajan-cadfem]

Hi @PProfizi,
sorry for late reply, but this problem has been solved with 2023 R2, DPF server 👍.

in general, it would be great to have some information about the minimum version of DPF server for examples.
I am aware that there is CI/CD pipeline for docs and it would run with the newest DPF server, but for consumer, it may not be case that they always have the newest DPF server version (traditional Ansys installation rollout takes time in larger companies).

[PProfizi]

Hi @kmahajan-cadfem,

You are right, we should mark this example as requiring a minimal version. We added this capability not long ago but just started using it for new examples.
I will mark this one as requiring DPF>=6.0 or 6.1 then.