How can I get the X and Y coordinates from an fplot graph? or from a function by parts?

Asked by Juan Soriano

Juan Soriano (view profile)

on 24 Jun 2019
Latest activity Commented on by Juan Soriano

on 24 Jun 2019

madhan ravi (view profile)

Hi,
I am relatively new to maltab. I am trying to get the X and Y coordinates of a function by parts I plotted with fplot. I tried doing the following:
[x1,y1]=fplot(...,...)
[x2,y2]=fplot(...,...)
However, I kept receiving a warning that said: 'Having two output arguments for fplot will be removed in a future release. Use the XData and
YData properties instead. ' Also, I think that x1 and y1 could have different lengths, and I needed them to have the same length.
I leave you here the following code I wrote:
syms t_f;
Mdestot=(mcar*acc+0.5.*Cd.*A.*ro.*(acc.*t_f).^2).*rr;
Mdescte=(0.5*Cd*A*ro*(acc*3.7)^2)*rr;
Mdessub=(mcar*g*sin(3)+0.5*Cd*A*ro*(acc*3.7)^2)*rr;
Mfinalrueda = piecewise(0<=t_f<=3.7, Mdestot,3.7<= t_f <=10, Mdescte, 10<=t_f<=15,Mdessub,15<=t_f<=20, 0);
Mfinalres=Mfinalrueda/3.45;
mfinalres=Mfinalres/Mb;
[x1,y1] =fplot(mfinalres,[0,20]);
I_des=Mfinalres/0.75;
[x2,y2]=fplot(I_des,[0,20]);
When I tried using XData and YData, I did something similar to:
h=fplot(mfinalres,[0,20]);
x1=get(h,'XData');
y1=get(h,'YData');
but did not work, because apparently you can't name an fplot.
So yeah, basically I'm stuck trying to obtain the x and y coordinates from a function by parts (I want to make a two column matrix, with the same length later on, that's why I would like them to be the same length).
Hope I explained myself clearly. Please tell me if I did not.(English is not my first language)
Thank you very much in advance

R2018a

madhan ravi (view profile)

on 24 Jun 2019

h = fplot(mfinalres,[0,20]);
x1 = h.XData
y1 = y.YData

Juan Soriano

Juan Soriano (view profile)

on 24 Jun 2019
haha I was going crazy, thank you very much!