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 2015-10-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/248163-how-to-show-a-velocity-vector-at-any-two-point-in-matlabs-on-path-curve-also-acceleration-vector-at

编辑： Manolis Michailidis 2015-10-12

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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Manolis Michailidis 2015-10-12

If i understand correctly you want to plot all together in one graph? when you say show volecity vector...

Rahman Ali 2015-10-12

编辑：Rahman Ali 2015-10-12

no simply for velocity.. leave acceleration..

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Answer 1

Manolis Michailidis 2015-10-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/248163-how-to-show-a-velocity-vector-at-any-two-point-in-matlabs-on-path-curve-also-acceleration-vector-at#answer_195670

编辑：Manolis Michailidis 2015-10-12

在 MATLAB Online 中打开

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.

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Rahman Ali 2015-10-12

path curve like that now i want

</matlabcentral/answers/uploaded_files/38341/6.PNG> now i want to show a velaocity vector at any two point on this curve mean to draw any two tangent to that curve..

Manolis Michailidis 2015-10-12

编辑：Manolis Michailidis 2015-10-12

在 MATLAB Online 中打开

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