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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 :
`
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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