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Re: [Getfem-users] specification of Grad expression

From: Yves Renard
Subject: Re: [Getfem-users] specification of Grad expression
Date: Mon, 11 Mar 2019 13:08:24 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.1

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 :

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,


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
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)
  20, rue Albert Einstein
  69621 Villeurbanne Cedex, FRANCE


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