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 <[email protected]>: > > > 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 ([email protected]) tel : (33) 04.72.43.87.08 > INSA-Lyon > 20, rue Albert Einstein > 69621 Villeurbanne Cedex, FRANCE > http://math.univ-lyon1.fr/~renard > > --------- >
