MATLAB: How to draw vector function

3d plotsfunctionvector

I want to plot a vector function in 3d, with one variable.

x = 2*sin(t)
y = 4*cos(t)
z = t

is my vector function. How can i make it on an easy way?

Best Answer

t = linspace(-10*pi, 10*pi);   %define the range you are plotting over
x = 2*sin(t);
y = 4*cos(t);
z = t;
plot3(x, y, z);
axis equal

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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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r = 1;
xo = 0;
yo = 0;
zo = 0;
m =20;
n = 10;
theta=0:2*pi/m:2*pi ;
phi=-pi/2:pi/10:pi/2 ;
[T,P] = meshgrid(theta,phi) ;
X = xo + r *cos(P).* cos(T);
Y = yo + r *cos(P).* sin(T);
Z = zo + r *sin(P) ;

Best Answer

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