# how to show a velocity vector at any two point in matlabs on path curve.also acceleration vector at any two point on velocity curve.

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### Answers (1)

Manolis Michailidis
on 12 Oct 2015

Edited: Manolis Michailidis
on 12 Oct 2015

If this is the case ou can use plot and hold on to achieve it.

t=( 0:0.01:3);

x = t.*exp(-3*t)+0.25*exp(-3*t);

v=exp(-3*t)/4 - 3.*t*exp(-3*t);

a =9*t.*exp(-3*t) - (15*exp(-3*t))/4;

plot(t,x);hold on;plot(t,v,'r');hold on;plot(t,a,'g');

legend('x-curve','volecity','acceleration');

hold on

I hope this helps.

##### 2 Comments

Manolis Michailidis
on 12 Oct 2015

I can't see your uploaded image, can you upload it somewhere else and post the link? or try to reupload it here. You can try to ask from the user to enter the points , of course the points should be in the right limits of t , and then you can plot the volecity v for only this 2 points, something like that maybe:

t1 = 'What is the first value? ';

x1 = input(t1);

t2 = 'What is the other value? ';

x2 = input(t2);

% create time vector with 100 points between the values user has set

T=linspace(x1,x2,100);

x = T.*exp(-3*T)+0.25*exp(-3*T);

v=exp(-3*T)/4 - 3*T.*exp(-3*T);

plot(T,x);hold on;plot(T,v,'r');

legend('x-curve','volecity');

grid on

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