scatteredInterpolant gives null matrix for collinear data . .
10 views (last 30 days)
Show older comments
Hello, I want to interpolate scattered data (x,y,z). x and y are collinear (x and y = [0.05 0.1 0.15 0.20 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6] ).
When I use:
F = scatteredInterpolant(x, y, z);
[Xq, Yq] = meshgrid(x, y);
Zq = F(Xq, Yq);
I get empty Zq with following error : The underlying triangulation is empty - the points may be collinear.
Please help me on this.
2 Comments
Answers (2)
Farough Rahimzadeh
on 29 Mar 2022
One trick you can do is to add one number to the end the array to remove the collinear correlation.
For example, my data is gravitational force at certain coordinates. Because I know gravitational force at 1e8 distance is roughphy equal to zero, I added one addition point of (1e8, -1e8, 0) to the data set to remove the linear correltion.
x = [1 2 3 4 5, 1e8];
y = [1 2 3 4 5, -1e8];
z = [1.8 1.2 2.2 1.9 1.2, 0];
0 Comments
See Also
Categories
Find more on Interpolation of 2-D Selections in 3-D Grids in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!