MATLAB: Rolve function around axis to create 3D surface.

3dplotsurface

Hello,

I am fairly new to matlab and know the basics. I am trying to create a 3D surface from the function y by revolving it around the x axis. The function is the profile of the tip of a bullet and I am looking to obtain a 3D plot. Thank you in advance!

x = linspace(0,1,100);
y = (2).*(x./12).^0.5;

Best Answer

See: Plotting an exponential exp(-x), in 3D? for an example.

Related Solutions

MATLAB: Add 2d plots along a 3d helix

Use this

close all; clc;
r=93.36;
theta=0:pi/50:10*pi;
%Trajectory in x-direction
x=-r.*cos(theta);
%Trajectory in y-direction
y=r.*sin(theta);
%Trajectory in z-direction
z=theta;
figure(1);
plot3(x,y,z);
xlabel('x');
ylabel('y');
zlabel('z');
grid on
hold on;
plot(x, y, 'r', 'LineWidth', 3);

MATLAB: Plot a curve as a vertical 3D surface in MATLAB

Try this:

x = linspace(0, 2*pi, 50);                      % Independent Variable

y = sin(x);                                     % Dependent Variable

z = [ones(size(x)); zeros(size(x))];            % ‘Z’ Matrix

figure(1)
surf([x; x], [y; y], z)
grid on
axis equal

Also, if you want more ‘levels’ in the z-direction:

x = linspace(0, 2*pi, 50);                              % Independent Variable
y = sin(x);                                             % Dependent Variable
z = [(1:-0.2:0)'*ones(size(x))];                        % ‘Z’ Matrix
figure(1)
surf(repmat(x,size(z,1),1), repmat(y,size(z,1),1), z)
grid on
axis equal

The ‘(1:-0.2:0)’ in the z calculation sets the number of ‘levels’ and values of the ‘levels’. Experiment with it to get the result you want.

NOTE — This requires x and y to be row vectors.

EDIT — Added plot image.

Best Answer

Related Solutions

MATLAB: Add 2d plots along a 3d helix

MATLAB: Plot a curve as a vertical 3D surface in MATLAB

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