Methods for CQUAD not available / Is initialization required after reading *.bdf?

[Brian C]

Hi,

I read in a BDF and I wanted to compute the area and the normal to an element.  The CQUAD class appears to have these methods.

I have a lot of the geometry information from the element; I can plot all the elements and they look great.  However, trying to use the methods results in errors like the one below.

Why is self.nodes_ref not populated?  self.nodes has a valid list of nodes.  

Is there an initialization method that is supposed to be called?

Best,

Brian

[Steven Doyle]

Hi Brian,

When you call the read_bdf function/method (a method is a function in a class), the xref=True flag is set. If you set it to False, you can use the model.cross_reference() method. The defaults are the same as xref, but you can disable the flags you don’t need if you want it to be faster.

Best,

Steve

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[Brian C]

What do you think are the best ways to learn pyNastran?  

1. This documentation (link)
2. Debugging mode in Python?
3. Experiment?
4. Ask questions?

I don't want to waste your time or the time of the members of this forum if I can find the answers myself.

I'm tempted to put together some thermal examples (that's just what I'm working on right now).  Would you like me to contribute them?  If so, what's the best way?  Be a contributor on the GitHub?

Best,

Brian

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Best wishes,

Brian Catanzaro, PhD

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