How to interpolate with a polynom in 3D?
1 次查看(过去 30 天)
显示 更早的评论
Hi all, I am working on a project and I need to obtain the polynom for a 3D table. Why? Because my idea is to use that polynom in Excel for calculus since I think it will be faster for iterations rathen than looking for values in a table, specially if the values are not in the table and an interpolation would be needed.
The table is in the images.
I found that with polyfit or polyfitn I could get the coefficients of a polynom. But I don't know how to insert the table in the Z.
Thank you very much,
Agustin. ![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1297460/image.jpeg)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1297460/image.jpeg)
0 个评论
回答(1 个)
Cameron
2023-2-16
Use interp2. Here's an example
x = 0.1:0.1:1; %sample x data
y = transpose(1:10); %sample y data
z = sin(x) - y.^x; %sample z data
interpX = 0.15; %your interpolated x value
interpY = 2.2; %your interpolated y value
interpZ = interp2(x,y,z,interpX,interpY); %interpolated value at that point
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Polynomials 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!