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**dbpatankar****Member**- From: Roorkee, Uttarakhand, India
- Registered: 2010-05-22
- Posts: 175

Hi,

I was just trying to export the stiffness matrix and load vector after ASSEMBLAGE command.

I modelled a simple Euler-Bernauli beam (in 3D) with only one element.

So the resulting stiffness matrix should be 12 X 12 and load vector should be 12 X 1.

However, the stiffness matrix exported has the dimension 24 X 24 and load vector has dimension 12 X 1.

Why the stiffness matrix is larger than expected? Am I missing something here?

Attaching a sample model with comm and med files.

Please have a look and let me know.

Moreover, I would also like to know the node numbering associated with matrix elements. I guess it should be in NUME_DDL, but couldnt get any document explaining all the methods. dir() on the module does not list all the methods/attributes available. Is it documented?

With regards,

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For justification of the size of stiffness matrix see document R3.03.01 Dualisation of boundary conditions

It''s a general principle for solving linear system with Code_Aster

Jean-Raymond Lévesque

Representative of [i]Code_Aster ProNet[/i]

[email]contact@code-aster-pronet.org[/email]

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**dbpatankar****Member**- From: Roorkee, Uttarakhand, India
- Registered: 2010-05-22
- Posts: 175

Thank you!

Any reference on node numbering/NUME_DDL part?

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