vectors must be the same length

I have position vector

r(t)=<t , t^2 , 2>,

I have to plot it using plot3 function and also plot tangent at the point P(-1 , 1, 2) but I cant figure it out. Can you help me please?

t = 0:pi/50:10*pi;
st = t;
ct = t.^2;

figure
plot3(st,ct,2)

[Image Analyst]

Can you explain in more detail what

r(t)=<t , t^2 , 2>

means? What is x, what is y, and what is the value (z)?

[Kuatra Patil]

it is position vector's i j k components and t is variable for time

[Image Analyst]

We're getting there, but not quite. So are you saying that

1. i, which is x, goes from some unspecified negative number up to 0
2. j, which is y, goes from some negative, unspecified t to some positive, unspecified t
3. k, which is z, goes from 2 up to some unspecified max z value.

Can you specify the unspecified range limits?

Answer 1

[madhan ravi]

Make the vectors the same length then exactly as the error message tells you! 2 is a scalar, each component of your vector represents x, y & z.

plot3(st,ct,repmat(2,1,numel(t)))