Unstructured grid to structured grid
조회 수: 10 (최근 30일)
이전 댓글 표시
Dear all, what would be the best way, in your opinion, to get a structured grid out of an unstructured grid?
What I have is something like this:
x y f
1 12 7
3 10 4
1 11 2
2.4 15 0
So basically x and y are totally random and in no specific order. What I need is to resample the values of f on a structured grid with a constant step.
I had a quick look at interp2 and it looks like it will only work if my vectors are strictly monotonic which is not the case as I have plenty of repeated values for x and y.
Thanks a lot
댓글 수: 0
채택된 답변
David Young
2014년 12월 20일
편집: David Young
2014년 12월 20일
scatteredInterpolant may do what you need. Like this:
x = [1 3 1 2.4].';
y = [12 10 11 15].';
f = [7 4 2 0].';
si = scatteredInterpolant(x, y, f); % using default linear interpolation
xint = (0.5:0.5:3.5).'; % regular grid
yint = (9.5:0.5:15.5).';
fint = si({xint yint})
댓글 수: 3
Emanuel
2019년 7월 31일
How does this work if you have a lookup table with x and y values only. So, transfer non-momotonic x values into a fixed (strictly momotonic) x step size with the corresponding (interpolated) y values ?
추가 답변 (1개)
Lorenzo
2014년 12월 20일
댓글 수: 1
David Young
2014년 12월 21일
I'd have to think that through - but scatteredInterpolant doesn't depend on having a grid at any stage - you can use the returned function, called si in my answer, to sample at any required points. To avoid the discontinuity in theta I would expect that converting everything to Cartesian coordinates might be the right thing to do.
참고 항목
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!