Surf function with interp: symmetric surface shown assymmetrically

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Hello All,
I have a surface Z formed by the following commands (very simplified version) and it is symmetric in XY plane (looking from the top or bottom). However when I use the "surf" command with 'interp', I get a slightly assymetric surface.
clc
clear all
Z=[0 0.1 0.3 0.1 0;
0 0.2198 0.4432532 0.2198 0;
0 0.4242 0.7898989 0.4242 0;
0 0.2198 0.4432532 0.2198 0;
0 0.1 0.3 0.1 0];
[X,Y] = meshgrid(0:1.5:6,0:1.5:6);
surf(X, Y, Z, 'LineStyle', '-', 'FaceColor', 'interp')
daspect([1,1,0.2])
colormap(jet)
colorbar
When I use decimal numbers instead of the Z values above though, I do not get such a problem.
Any ideas how to obtain the symmetric surface at XY plane?
Cheers.

Risposta accettata

Bruno Luong
Bruno Luong il 17 Nov 2018
Modificato: Bruno Luong il 17 Nov 2018
The color interpolation carried out by MATLAB is not symetric by values but also by order. This induces the defect.
To trick MATLAB you have te reorganize the data
Z=[0 0.1 0.3 0.1 0;
0 0.2198 0.4432532 0.2198 0;
0 0.4242 0.7898989 0.4242 0;
0 0.2198 0.4432532 0.2198 0;
0 0.1 0.3 0.1 0];
[X,Y] = meshgrid(0:1.5:6,0:1.5:6);
x = linspace(-1,1,size(Z,2));
y = linspace(-1,1,size(Z,1));
close all
hold on
for k=1:4
if k<=2
ix = find(x>=0);
else
ix = flip(find(x<=0));
end
if mod(k,2)==0
iy = find(y>=0);
else
iy = flip(find(y<=0));
end
surf(X(iy,ix), Y(iy,ix), Z(iy,ix), 'LineStyle', '-', 'FaceColor', 'interp')
end
daspect([1,1,0.2])
colormap(jet)
colorbar
Defect coloring when using single SURF command

Più risposte (1)

madhan ravi
madhan ravi il 17 Nov 2018

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