MATLAB: Plotting line function in 3D

3d plotsfunctions

t = linspace(0, 4*pi);
x = @(t)(4+sin(a*t))*cos(3*t);
y = @(t) (4+sin(a*t))*sin(3*t);
z = @(t) cos(3*t);
How is it possible to plot this function?

Best Answer

I had to supply a value for ‘a’, assuming it is a scalar.
This works:
t = linspace(0, 4*pi);
a = 1;                                                      % Guess The Value Of ‘a’
x = @(t)(4+sin(a*t)).*cos(3*t);
y = @(t) (4+sin(a*t)).*sin(3*t);
z = @(t) cos(3*t);
figure(1)
plot3(x(t), y(t), z(t))
grid on
You need to vectorize your functions to do element-wise operations (replacing ‘*’ with ‘.*’). See the documentation on Array vs. Matrix Operations for details.
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