Patch error when I plot x,y,z

I wanted to plot the patch. but the 'z' value returns only zero in plot.

I want to plot 3 patches with same x,y value. only 'z' value changes

I attach the data and the code.

for i = 1:length(hex_3d)
patch(hex_3d{i,1},hex_3d{i,2},hex_3d{i,3});
hold on
patch(hex_3d{i,1},hex_3d{i,2},hex_3d{i,4});
patch(hex_3d{i,1},hex_3d{i,2},hex_3d{i,5});
end

Please Let me know how to solve this problem.

Thanks.

Answer 1

[Star Strider]

Make them different colours and specify a view angle and it works —

LD = load(websave('hex_3d','https://www.mathworks.com/matlabcentral/answers/uploaded_files/1105925/hex_3d.mat'))

LD = struct with fields:
    hex_3d: {182×5 cell}

hex_3d = LD.hex_3d;

hex_3d = 182×5 cell array
    {4×1 double}    {4×1 double}    {4×1 double}    {4×1 double}    {4×1 double}
    {6×1 double}    {6×1 double}    {6×1 double}    {6×1 double}    {6×1 double}
    {8×1 double}    {8×1 double}    {8×1 double}    {8×1 double}    {8×1 double}
    {8×1 double}    {8×1 double}    {8×1 double}    {8×1 double}    {8×1 double}
    {8×1 double}    {8×1 double}    {8×1 double}    {8×1 double}    {8×1 double}
    {8×1 double}    {8×1 double}    {8×1 double}    {8×1 double}    {8×1 double}
    {6×1 double}    {6×1 double}    {6×1 double}    {6×1 double}    {6×1 double}
    {8×1 double}    {8×1 double}    {8×1 double}    {8×1 double}    {8×1 double}
    {6×1 double}    {6×1 double}    {6×1 double}    {6×1 double}    {6×1 double}
    {6×1 double}    {6×1 double}    {6×1 double}    {6×1 double}    {6×1 double}
    {6×1 double}    {6×1 double}    {6×1 double}    {6×1 double}    {6×1 double}
    {6×1 double}    {6×1 double}    {6×1 double}    {6×1 double}    {6×1 double}
    {6×1 double}    {6×1 double}    {6×1 double}    {6×1 double}    {6×1 double}
    {9×1 double}    {9×1 double}    {9×1 double}    {9×1 double}    {9×1 double}
    {4×1 double}    {4×1 double}    {4×1 double}    {4×1 double}    {4×1 double}
    {4×1 double}    {4×1 double}    {4×1 double}    {4×1 double}    {4×1 double}

figure
hold on
for i = 1:length(hex_3d)
    patch(hex_3d{i,1},hex_3d{i,2},hex_3d{i,3},'b');
    patch(hex_3d{i,1},hex_3d{i,2},hex_3d{i,4},'g');
    patch(hex_3d{i,1},hex_3d{i,2},hex_3d{i,5},'r');
end
hold off
grid on
view(30,30)

.

[Sierra]

Thanks Strider! It perpectly worked.

additionally, I want to make hexagonal column with these 3 patches.

is it possible to do?

I don't want just draw the line because it seems a polyshape or polygon but it's not a polsyshpae or polygon in matlab workspace.

I want the hexagonal column as one polyshape or polygon.

[Star Strider]

As always, my pleasure!

I am not certain what result you want with respect to the hexagonal columns. One option would be to use a surf plot, however I am not certain how best to concatenate the cell vectors to create matrices for that.

[Sierra]

I want to plot like this and I don't want to just draw lines.

for example, i wanna make a patch with 4 red points.

Thanks for keep answering me. Strider.

[Star Strider]

This is the best I can do —

LD = load(websave('hex_3d','https://www.mathworks.com/matlabcentral/answers/uploaded_files/1105925/hex_3d.mat'))

LD = struct with fields:
    hex_3d: {182×5 cell}

hex_3d = LD.hex_3d;
% figure
% hold on
% for i = 1:length(hex_3d)
%     patch(hex_3d{i,1},hex_3d{i,2},hex_3d{i,3},'b')%, 'EdgeColor','none');
%     patch(hex_3d{i,1},hex_3d{i,2},hex_3d{i,4},'g')%, 'EdgeColor','none');
%     patch(hex_3d{i,1},hex_3d{i,2},hex_3d{i,5},'r')%, 'EdgeColor','none');
% end
% hold off
% grid on
% view(30,30)

x = cell2mat(hex_3d(:,1))*[1 1]

x = 1129×2

126.3342 126.3342 126.3343 126.3343 126.3352 126.3352 126.3343 126.3343 126.3452 126.3452 126.3424 126.3424 126.3414 126.3414 126.3436 126.3436 126.3477 126.3477 126.3467 126.3467

y = cell2mat(hex_3d(:,2))*[1 1]

y = 1129×2

37.4611 37.4611 37.4629 37.4629 37.4612 37.4612 37.4596 37.4596 37.4255 37.4255 37.4303 37.4303 37.4324 37.4324 37.4324 37.4324 37.4251 37.4251 37.4233 37.4233

z = [cell2mat(hex_3d(:,3)) cell2mat(hex_3d(:,5))]       % Only Need The Upper & Lower Since They All Appear To Be The Same 

z = 1129×2

0 1000 0 1000 0 1000 0 1000 0 1000 0 1000 0 1000 0 1000 0 1000 0 1000

figure
surf(x, y, z, 'EdgeColor','k')
grid on
view(30,45)
colormap(summer)

% shading('interp')

There appear to be a lot of extra horzontal lines and some incomplete ‘columns’ (they look like basalt columns to me), however since I do not understand the data, I am not certain how to eliminate them, or otherwise deal with them.

.