To crate a 2D lookup table with interpolation for matrix data and to crate a function of (x,y) (inputs) give the output from the matrix
22 views (last 30 days)
Show older comments
I have data matrix, for an example:
A=[0,1,2,3,4,5; 2,3,5,6,6;3 3 5 0 9]; % A data matrix.
x=-100:5:100; % x-axis
y=-100:5:100; % y-axis
i want to for any (x,y) value (in the range -100 to 100) to obtain the matrix vaule, so two things need to do covert the index A(i,j) to A(x,y) and to inerpolated between breaking point, for an eaxmple A(1,2.5) .
0 Comments
Answers (1)
KSSV
on 1 Aug 2019
Read about interp2.
n = 20 ;
Z = peaks(n) ;
[X,Y] = meshgrid(1:n,1:n) ;
[Xi,Yi] = meshgrid(1:0.1:n,1:0.1:n) ;
Zi = interp2(X,Y,Z,Xi,Yi) ;
2 Comments
John D'Errico
on 4 Aug 2019
That is EXACTLY what interp2 will do. It does not just sample the data. It interpolates the data array at any list of points. And this is exactly what you asked for.
See Also
Categories
Find more on Interpolation 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!