interpolation coefficients in tri2grid

2 次查看（过去 30 天）

Richard Garner 2014-7-9

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/141182-interpolation-coefficients-in-tri2grid

编辑： John D'Errico 2017-7-18

I could not find an explanation as to how to use the interpolation coefficients (a2 and a3) that are returned by tri2grid: [uxy,tn,a2,a3]=tri2grid(p,t,u,x,y). I would like to export these and allow users without Matlab to interpolate the solution to points not on the mesh vertices. I am familiar with there being three coefficients that relate solution at arbitrary point (x,y) to solutions on vertices of triangle in which (x,y) is located. To wit: u(x,y) = a1*u1 + a2*u2 + a3*u3 (for linear interpolation). I can only imagine that the a2 and a3 from tri2grid are normalized in some fashion and equivalent to these (possibly by area of triangle???)

A related question (I think): what can one do with the a1, a2, a3 coefficients returned by pdetrg. That is, the a1,2,3 in [ar,a1,a2,a3]=pdetrg(p,t). I wonder if I can do the interpolations with these. My sense is that they are related to the a2, a3 from tri2grid.

3 个评论
显示 1更早的评论隐藏 1更早的评论

elisabetta carlini 2017-7-18

Hello Richard, how you find out how to interpolate a function defined on a triangular mesh to an array of arbitrary points? Thanks Elisabetta

John D'Errico 2017-7-18

编辑：John D'Errico 2017-7-18

Elisabeth - Note that you have made this into a zombie question, re-animated years after this individual has even bothered to visit this web site. So ask your question on Answers directly, at least if you hope for an answer.

请先登录，再进行评论。

请先登录，再回答此问题。