# How to plot two trajectories in Matlab?

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Sarah Hamdan on 29 Apr 2020
I'm trying to plot two different trajectories on the same plot, but it's not working and the graphs are sitting in the III and IV quadrant for some reason. Why Isn't it working?
T=[0:10:3000];
function [xa,ya]= trajectory(VoA,ThetaA,T,g)
%Use formula (3) for xa
xa=VoA*cosd(ThetaA)*T;
%Use formula (1) for ya
ya=(VoA*sind(ThetaA)*T)-(0.5*g*T.^2)+2000;
plot(xa,ya)
end
[xa,ya]= trajectory(VoA,ThetaA,T,g)
hold on
function [xb,yb]= trajectory(VoB,ThetaB,T,g)
%Use formula (1) for yb
yb=(VoB*sind(ThetaB))*T-(0.5*g*T.^2);
%Use formula (5) for xb
xb=xoa-(VoB*cosd(ThetaB)*T);
plot(xb,yb)
end
[xb,yb]= trajectory(VoB,ThetaB,T,g)
P= InterX([xa;ya],[xb;yb])
##### 2 CommentsShow 1 older commentHide 1 older comment
Mrutyunjaya Hiremath on 30 Apr 2020
Edited: Mrutyunjaya Hiremath on 2 May 2020
@ Sarah Hamdan
Ok study the attached code.

Mrutyunjaya Hiremath on 29 Apr 2020
Edited: Mrutyunjaya Hiremath on 29 Apr 2020
Hello Sarah Hamdan,
1. Don't paste code as a image, use option 'Insert aline code'
2. Don't 2 different function body with same function name .
3. Don't use both script and function in same file.
Here is the solution ...
% 521560-how-to-plot-two-trajectories-in-matlab
function MA521560
[xA, yA] = trackA;
plot(xA,yA);
hold on;
[xB, yB] = trackB;
plot(xB,yB);
P = InterX([xA;yA],[xB;yB]);
plot(xA,yA,xB,yB,P(1,:),P(2,:),'ro');
hold off;
end
function [xA, yA] = trackA
xA = randi(10,[1,10]);
yA = randi(10,[1,10]);
end
function [xB, yB] = trackB
xB = randi(10,[1,10]);
yB = randi(10,[1,10]);
end
Replace trackA and trackB function body with your code.
Mrutyunjaya Hiremath on 29 Apr 2020
function [xa,ya] = trajectoryA(VoA,ThetaA,T,g)
%Use formula (3) for xa
xa = VoA*cosd(ThetaA)*T;
%Use formula (1) for ya
ya = (VoA*sind(ThetaA)*T)-(0.5*g*T.^2)+2000;
end