Creating multiple cylinders in different coordinates

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sevgi
sevgi 2024-2-27
评论： Star Strider 2024-3-2
I want to create cylinders with similar diameters and heights at various locations in x,y coordinates.
Could you help me
Thank you.

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Star Strider
Star Strider 2024-2-27
编辑：Star Strider 2024-3-1
Ran in:
Perhaps this —
[X,Y,Z] = cylinder(1,20);
cm = colormap(turbo(10));
figure
hold on
for k = 1:10
ofst = randi(9,2);
surf(X+2*ofst(1), Y+2*ofst(2), Z*5, 'FaceColor',cm(k,:))
end
hold off
grid on
axis('equal')
view(-27,30)
I set them to be different colours. If you wnat them all the same colour, just use:
surf(X+2*ofst(1), Y+2*ofst(2), Z*5)
instead.
EDIT — (1 Mar 2024 at 19:30)
In response to the rpoated request —
[X,Y,Z] = cylinder(9,20);
ofst = [0 0; 20 0; 10 20];
a = linspace(0,2*pi);
xc = 9*cos(a);
yc = 9*sin(a);
figure
hold on
for k = 1:size(ofst,1)
surf(X+ofst(k,1), Y+ofst(k,2), Z*65, 'FaceColor','g', 'EdgeColor','g', 'FaceAlpha',0.25)
plot3(xc+ofst(k,1), yc+ofst(k,2), 65*ones(size(a)), '-k', 'LineWidth',1)
plot3(xc+ofst(k,1), yc+ofst(k,2), 0*ones(size(a)), '-k', 'LineWidth',1)
end
hold off
grid on
axis('equal')
view(-27,30)
.

更多回答（2 个）

Aquatris
Aquatris 2024-2-27
Ran in:
Not sure how you want them to look or what you need but here is one simple way
[X,Y,Z] = cylinder(2); % create X,Y,Z coordinates for a cyclinder with a radius 2
% define center positions
cycPos1 = [1 1 1];
cycPos2 = [4 4 4];
cycPos3 = [-3 -3 -3];
figure(1)
plotCyclinder(cycPos1,X,Y,Z)
plotCyclinder(cycPos2,X,Y,Z)
plotCyclinder(cycPos3,X,Y,Z)
% function that draws the cyclinders
function plotCyclinder(pos,X,Y,Z)
surf(pos(1)+X,pos(2)+Y,pos(3)+Z)
hold on
end
  1 个评论
sevgi
sevgi 2024-3-1
I want to create three solid cylinder volumes with a radius of 9 mm and a height of 65 mm at positions [0 0 0], [20 0 0], [10 20 0].
After that, I want to examine the thermal situation in the case of natural convection by defining temperature to the surface. I want to make an unsteady solution.
Could you help me.
Thank you for your interest.

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Matt J
Matt J 2024-3-1
编辑：Matt J 2024-3-1
Using cylindricalFit() from this FEX download
https://www.mathworks.com/matlabcentral/fileexchange/87584-object-oriented-tools-to-fit-plot-conics-and-quadrics?s_tid=FX_rc2_behav
centers={[0 0 0],[20 0 0],[10 20 0]};
for i=1:3
plot(cylindricalFit.groundtruth([],centers{i},9,65,[0,90]));hold on
end; hold off

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