% Here's how to plot a 3-d parametric curve
% r(t) = <x(t),y(t),z(t)>
% for a <= t <= b.  In this example, we plot <cos(t),sin(t),t>
% (the helix) for -2 <= t <= 7.
% I didn't have time to translate the rv and rva programs
% to MATLAB, sorry; if you only have MATLAB, you'll have to do
% velocity and acceleration vectors by hand.

syms x y z t
x=cos(t)
y=sin(t)
z=t
ezplot3(x,y,z,[-2 7])
% something fun, try it:
ezplot3(x,y,z,[-2 7],'animate')