How can I custom cylinder rotate axis?

Hi

I have a 2D graph and I want make it 3D via cylinder. but cylender rotating it about x-axis.

is there anyway to change this? for example rotate about y-axis

[Matt J]

but cylender rotating it about x-axis.

I assume you mean the z-axis.

Answer 1

[Matt J]

Another approach:

[Xq,Zq]=ndgrid(linspace(-3,3,100));
[~,Rq]=cart2pol(Xq,Zq);

func=@(r) sin(r)./r;  %The 1D profile

x=linspace(0,3,100);
y=func(4*x);
Yq=interp1(x,y,Rq); %rotated about Y-axis

surf(Xq,Yq,Zq,'EdgeColor','none')
xlabel 'X', ylabel 'Y', zlabel 'Z'

[ali alizadeh]

Thank you again

But I just have a 2D plot ( the blue one That I attached at question ) and I want to made a 3D plot with rotating this. I have not any function of this.

[Matt J]

You can replace the line

Yq=interp1(x,y,Rq); %rotated about Y-axis

with whatever (x,y) plot data that you do have.

[ali alizadeh]

sorry mr Matt J

I attach my data. may you plot it?

Please plot this datas, with rotating graph about y-axis.

data=load('5.csv');
x=data(:,2);
y=data(:,1); y=y/max(y);


a=3*max(abs(x));
[Xq,Zq]=ndgrid(linspace(-a,a,2000));
[~,Rq]=cart2pol(Xq,Zq);

Yq=interp1(x,y,Rq); %rotated about Y-axis

surf(Xq,Yq,Zq,'EdgeColor','none','FaceAlpha',0.6)
xlabel 'X', ylabel 'Y', zlabel 'Z'

[Matt J]

I 've added the necessary code to your last comment and run it.

Answer 2

[Matt J]

For example,

[X,Z,Y] = cylinder(2+cos(0:pi/10:2*pi));

surf(X,Y,Z)
xlabel 'X', ylabel 'Y', zlabel 'Z'

[ali alizadeh]

Thank you mr Matt J.

But I tried it before and it's didn't works.

[Matt J]

But I ran the code for you above and demonstrated that it does work!

[ali alizadeh]

Many Thanks. it's nicly works.

[Tuan]

Hi, I have just the same question, but this time around y-axis, to create a cup with 2 parabol, can you help me with the code cause im stuck with all the tutorial online