Help me to draw graphic for vector xyz :)

Well, can someone here help me to draw a vector graphic ? it needs to use x, y, z graphic (3d one) and the function will be : r(t)=5t^2i - 2tj + 20z m; where the t will start from 0 until 1 (0, 0.01, 0.02, 0.03, ... , 1). For example : if the t=0 then the r(t) will on (0, 0, 2) and so on. Thanks and sorry for the bad English.

Answer 1

[Andrew]

Dear Utau,

I think you should create three variables x,y,z. x=5t^2i; y=-2tj; and z=20zm;

Then use function mesh, surf or plot3, or some else (I don't remember, but you'll find them in the Help).

I hope that will help you!

[UtauYuiki]

Well, thanks for the answer, but I still cannot understand well, can you help me to draw it or something, so maybe I can understand from the picture. Sorry for asking too much :)

Answer 2

[Iain]

 t = 0:0.01:10
 x = 5*t.^2;
 y = -2*t;
 z = 2;

 plot3(x,y,z)

Make sure you get x, y and z correct ;)

[UtauYuiki]

Well, thanks for the answer, but I still cannot understand well, can you help me to draw it or something, so maybe I can understand from the picture. Sorry for asking too much :)

[Iain]

It plots a single line. Try executing the following code to get an example 3D vector

 t = 0:0.01:10;

 x = sin(2*pi*4*t); %A sine wave @ 4Hz
 y = cos(2*pi*4*t); % A cosine wave @4 Hz
 z = t; % 
 plot3(x,y,z) % This line DRAWS the line I just made up - All of it.

Are you trying to achieve something else?

Then, you should click the rotate button and rotate the thing that you just plotted.