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Re: [Getfem-users] manually set deformation beforecompute_tangent_matrix

From: Julien Pommier
Subject: Re: [Getfem-users] manually set deformation beforecompute_tangent_matrix
Date: Fri, 04 Jan 2008 16:21:24 +0100
User-agent: Internet Messaging Program (IMP) 3.2.6


I think you should be able to do everything you need with the "lower level"
assembly functions instead of bricks (using gf_asm('nonlinear elasticity',..))

But as it is not a lot of work, I just committed a patch which adds an
"gf_mdstate_set" function for the interface:

(However, please note that I did not check it on matlab, I just did a quick test
on python)


Quoting Igor Peterlik <address@hidden>:

> Hello,
> we have been running to the same problem with the Matlab interface.
> More precisely, we utilize GetFEM for assembling the stiffness and
> tangent stiffness matrices using non-linear incompressible brick, but
> we want to solve the system with Matlab fsolve.
> Therefore,  in each iteration of fsolve we need to
> (a) set the actual estimation of the displacement  vector (model state
> vector)
> (b) call the assembling procedure
> (c) retrive the actual assembled residual and tangent matrix
> Both (b) and (c) are clear, since there are corresponding matlab interfaces,
> however, there is no interface for doing (a) and we are not capable to add
> this
> functionality to the interface by ourselves.
> So, is there any other way how to do this or is it a feature that should be
> implemented in future release?
>                               Thank you
>                                                                    Igor
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> Getfem-users mailing list
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