# 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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Rahman Ali on 12 Oct 2015
Edited: Manolis Michailidis on 12 Oct 2015
we have path curve "x = t*exp(-3*t)+0.25*exp(-3*t);" time=t=( 0:0.01:3).. velocity=exp(-3*t)/4 - 3*t*exp(-3*t) accleration =9*t*exp(-3*t) - (15*exp(-3*t))/4
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Rahman Ali on 12 Oct 2015
no simply for velocity.. leave acceleration..

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 CommentsShowHide 1 older comment
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