why surface plot is connecting its edges?

Question

Wilson Duarte 2021-1-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/712893-why-surface-plot-is-connecting-its-edges

评论： Star Strider 2021-1-10

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.

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Walter Roberson 2021-1-10

在 MATLAB Online 中打开

data_surf.xlsx

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 2021-1-10

编辑：Wilson Duarte 2021-1-10

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

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Answer 1

Star Strider 2021-1-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/712893-why-surface-plot-is-connecting-its-edges#answer_594838

在 MATLAB Online 中打开

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')