Path Operations within pyMAPDL and MAPDL

[peluho]

Dear all,

I was looking to the example for path operations, and I found several issues to launch and to understand what I'm doing wrong.

The following line did not work at all:

mapdl.post_processing.plot_nodal_displacement(lighting=False, show_edges=True) 

I replaced by this and work

result = mapdl.result
result.plot_nodal_displacement(0,'norm',lighting=False, show_edges=True)

The problem I face it's when I try this part of the code:

table = np.genfromtxt(path_out.splitlines()[1:])
print("Numpy Array from MAPDL Shape:", table.shape)

I got an exception and I'm not able to make it work, anyone has faced this issued before?

Thank you very much,

David

[germa89]

Hi @peluho

1. Have you tried:

mapdl.post_processing.plot_nodal_displacement("norm", lighting=False, show_edges=True) 

??

2. For the numpy error, I will need the full code that lead to that issue, as well as the full exception traceback.

Kind regards,

[peluho]

hi @germa89, I tried the command as you suggested, but I got an exception:

I think the rest of errors I got was because of the ANSYS v18.0, when I try with A2020 R1 everything worked perfect, a part from the mapdl.post_processing.plot_nodal_displacement(0, "norm", lighting=False, show_edges=True) that I fixed as follows:

result=mapdl.result
result.plot_nodal_displacement(0, "norm", lighting=False, show_edges=True)

EXCEPTION
mapdl.post_processing.plot_nodal_displacement(0, "norm", lighting=False, show_edges=True)

CRITICAL -  -  logging - handle_exception - Uncaught exception
Traceback (most recent call last):
  File "C:\Users\perezd\Documents\03_Biblioteca\22_python\02.Examples\path_operations.py", line 68, in <module>
    mapdl.post_processing.plot_nodal_displacement(0, "norm", lighting=False, show_edges=True)
  File "C:\Users\perezd\AppData\Local\Programs\Python\Python37\lib\site-packages\ansys\mapdl\core\post.py", line 880, in plot_nodal_displacement
    disp = self.nodal_displacement(component)
  File "C:\Users\perezd\AppData\Local\Programs\Python\Python37\lib\site-packages\ansys\mapdl\core\post.py", line 821, in nodal_displacement
    component = check_comp(component, DISP_TYPE)
  File "C:\Users\perezd\AppData\Local\Programs\Python\Python37\lib\site-packages\ansys\mapdl\core\post.py", line 54, in check_comp
    raise TypeError("Component must be a string")
TypeError: Component must be a string

Process finished with exit code 1

[germa89]

My mistake, it should be as @mikerife mentioned:

mapdl.post_processing.plot_nodal_displacement("norm", lighting=False, show_edges=True) 

[mikerife]

Hi @peluho The first field of the mapdl.post_processing.plot_nodal_displacement is the component to plot. So the command is:

mapdl.post_processing.plot_nodal_displacement("norm", lighting=False, show_edges=True)

The post_processing method respects MAPDL commands so the SET command is used to read in the specific set of results from the result file. Whereas the result method is stand-alone so the first item of the plotting command is to define which set of results to plot.

Also an example of path operations can be found here:

https://mapdl.docs.pyansys.com/examples/gallery_examples/00-mapdl-examples/path_operations.html#sphx-glr-examples-gallery-examples-00-mapdl-examples-path-operations-py

Mike