MATLAB Mathematics - SERC - Index of

2 Polynomials and Interpolation
2 Generate a finer mesh for interpolation:
[xi,yi] = meshgrid(-3:0.25:3);
3 Interpolate using nearest neighbor interpolation:
zi1 = interp2(x,y,z,xi,yi,'nearest');
4 Interpolate using bilinear interpolation:
zi2 = interp2(x,y,z,xi,yi,'bilinear');
5 Interpolate using bicubic interpolation:
zi3 = interp2(x,y,z,xi,yi,'bicubic');
6 Compare the surface plots for the different interpolation methods.
6
6
6
4
4
4
2
2
2
0
0
0
−2
−2
−2
−4
−4
−4
−6
3
2
1
0
−1
−2
−3
−3
−2
−1
0
1
2
3
−6
3
2
1
0
−1
−2
−3
−3
−2
−1
0
1
2
3
−6
3
2
1
0
−1
−2
−3
−3
−2
−1
0
1
2
3
surf(xi,yi,zi1)
% nearest
surf(xi,yi,zi2)
% bilinear
surf(xi,yi,zi3)
% bicubic
2-14