How can I use interp2 or interp3 for data without using MESHGRID or NGRID previously?

15 次查看（过去 30 天）
Diego Flores
Diego Flores 2013-5-30
I have coordinates X, Y, Z each of one is a Matrix of 67 x 147. Each Matrix was no generated by MESHGRID or NGRID method but just were adjusted by means reshape() to be visualize with surf(). However when I try to use interp2() to get a value that I need. There is a error that indicates that data were not generated with meshgrid(). How can I convert the data to interpolate?.
Best Regards
Diego F.

请先登录，再回答此问题。

回答（1 个）

Walter Roberson
Walter Roberson 2013-5-30
Interpolation for 2-D gridded data in meshgrid format
ZI = interp2(X,Y,Z,XI,YI) returns matrix ZI containing elements corresponding to the elements of XI and YI and determined by interpolation within the two-dimensional function specified by matrices X, Y, and Z. X and Y must be monotonic, and have the same format ("plaid") as if they were produced by meshgrid.
Are your X and Y matrices monotonic and "plaid" ? So one of them goes like
1 2 3
1 2 3
1 2 3
and the the other one goes like
4 4 4
5 5 5
6 6 6
?
  2 个评论
Diego Flores
Diego Flores 2013-5-30
Hi Walter, thanks for the answer.
The Matrices are monotonic but they are not "plaid".
X=0.1216967163 0.1216976461 0.1216987718 ... ...
0.1217044517 0.1217053814 0.1217065067 ... ...
0.1217115548 0.1217124842 0.1217136092 ... ...
... ... ...
... ... ...
Y=0.00358609375 0.00358599648 0.003585879951 ... ...
0.003313193137 0.00331309534 0.00331297815 ... ...
0.003041094743 0.00304099621 0.003040878105 ... ...
.... .... ....
.... .... ....
I think the "plaid" matrices just work for simple examples, but in real problems the matrices are not "plaid" and interpolation methods available in MATLAB fail.
I hope there is a solution
Thanks in advance
Diego

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Interpolation 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by