Re: [Getfem-users] specification of Grad expression

[Yves Renard]

Dear Tetsuo,

Yes, in the expression Grad_u * h, h is a direction vector.

Best Regards,

Yves

Le 11/03/2019 à 13:31, Tetsuo Koyama a écrit :
> Dear Yves
>
> Thank you for your reply.
> I really like the design of regular expression.
> Is h means direction vector?
> Sorry to ask about such minor details. I just want to be sure.
>
> Best Regards,
>
> Tetsuo
>
> 2019年3月11日(月) 21:08 Yves Renard <address@hidden>:
> > Dear Tetsuo,
> >
> > It is not easy to find, but the index order in a tensor is shortly
> > explained in the following part of the documentation :
> >
> > http://getfem.org/project/appendixA.html#example-of-elementary-matrix
> >
> > For a gradient, each row is the gradient of a component in such a way
> > that Grad u * h is the derivative in the direction h (so in a sense it
> > is a derivative)
> >
> > Best Regards,
> >
> > Yves
> >
> >
> > Le 11/03/2019 à 12:17, Tetsuo Koyama a écrit :
> > > Dear GetFEM++ Project
> > >
> > > Sorry to ask many question.
> > > I want to ask about regular expression.
> > > When using "Grad_" in regular expression in 3D MeshFem. It seems that
> > > it create 3D tensor. My question is that the meaning of line and
> > > column.
> > > In my forecast, the line is the direction of variable and column is
> > > the direction of gradient. Is it correct?
> > > Is there any related part in the document?
> > > Thank you for reading.
> > >
> > > Best Regard Tetsuo.
> > --
> >
> >     Yves Renard (address@hidden)       tel : (33) 04.72.43.87.08
> >     INSA-Lyon
> >     20, rue Albert Einstein
> >     69621 Villeurbanne Cedex, FRANCE
> >     http://math.univ-lyon1.fr/~renard
> >
> > ---------

--

  Yves Renard (address@hidden)       tel : (33) 04.72.43.87.08
  INSA-Lyon
  20, rue Albert Einstein
  69621 Villeurbanne Cedex, FRANCE
  http://math.univ-lyon1.fr/~renard

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