Re: [Getfem-users] specification of Grad expression

[Tetsuo Koyama]

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
>
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>