why surface plot is connecting its edges?
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Wilson Duarte
on 9 Jan 2021
Commented: Star Strider
on 10 Jan 2021
I need to create a 4d plot and am using the surf plot with the colors being the 4th dimension of the graph, however, for some data sets the edges of the surface is connecting together as can be seen in the first image, the second image uses the same script but it does not connect the edges. Any help will be very appreciated.
5 Comments
Walter Roberson
on 10 Jan 2021
Your x does recycle
T = readtable('data_surf.xlsx');
T.Properties.VariableNames = {'x', 'y', 'v'};
plot(T.x)
minx = min(T.x);
maxx = max(T.x);
miny = min(T.y);
maxy = max(T.y);
xvec = linspace(minx, maxx);
yvec = linspace(miny, maxy);
[X,Y] = ndgrid(xvec, yvec);
F = scatteredInterpolant(T.x, T.y, T.v);
V = F(X,Y);
surf(X, Y, V, 'edgecolor', 'none')
Accepted Answer
Star Strider
on 10 Jan 2021
Try this for the file provided, and the others that likely have similar formats.
Note — It is only necessary to reshape the matrix, and that griddata (as much as I like the function) is not necessary here.
The Code —
D = readmatrix('data_surf.xlsx');
[U2,ix] = unique(D(:,2)); % Determine Initial Indices Of Repeated Elements
ixd = diff(ix); % Lenmgth Of Repeated Elements
Dr = reshape(D,mean(ixd),[]); % Reshape Data Matrix
collen = size(Dr,2)/size(D,2); % Column Block Lengths
for k = 1:size(D,2)
M{k} = Dr(:,(1:collen)+(k-1)*collen); % Segment By Column Blocks
end
figure
surf(M{1}, M{2}, M{3})
grid on
xlabel('Current')
ylabel('SOC')
zlabel('Parameter')
The Plot —
.
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