How to interpolate values

1 次查看（过去 30 天）

chaos4u2 2013-3-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/66265-how-to-interpolate-values

Hello. I have the question about how would you interpolate some values. For example, I have:

x      y       z
1      4       7 
3      6       9

I want a point between (1,4) and (3,6) with the mean value of z.

Thank you in advanced!!

4 个评论
显示 2更早的评论隐藏 2更早的评论

Matt Kindig 2013-3-7

在 MATLAB Online 中打开

Do you just mean that you want the mean of the x, y, and z coordinates? If so, your middle point would simply be

mid = mean([x, y, z], 1);

Or are you asking something else?

chaos4u2 2013-3-7

Thank your for answering.

Not exactly. I have a file .dat of coordinates x,y,z. About 2 million data or even more.

What I want is to reduce all, for example at 10.000. But I don't know how to do it. I thought to do an interpolation, but I'm realising that's not a good idea.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Sean de Wolski 2013-3-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/66265-how-to-interpolate-values#answer_77779

在 MATLAB Online 中打开

There aren't enough points to perform a 2d scattered interpolation which requires a Delaunay Triangulation under the hood. Instead, just use interp1 twice:

interp1([1 4],[7 9],2.5)

or acquire more data (recommended).