why surface plot is connecting its edges?

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.

[Walter Roberson]

Your Current data appears to loop back to the beginning.

[Wilson Duarte]

Unfortunately not. I attached the data I am using for the graph and the code to generate the plot is below.

x is in the first column, y in the second and v in the third.

[xq, yq] = meshgrid(x, y);

vq = griddata(x, y, v, xq, yq);

surf(x, y, vq, 'FaceColor', 'b')

[Image Analyst]

I don't think that is your whole program. For example there is nothing there that created the legend or labeled the axes. So some code is missing. Please post your whole program.

[Walter Roberson]

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')

[Wilson Duarte]

all the variables recycle because for each temperature I have 9 values of x (SOC) and for each value of SOC I have 15 values of y (current)

your solution does work for the graph but I cannot use it since the grid shows the position of the each parameter and I need this as well

thank you anyways

Answer 1

[Star Strider]

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 —

.

[Wilson Duarte]

it works, thank you a lot

[Star Strider]

As always, my pleasure!