how can i plot the arrows like in the targeted phase-plane portraits at the initial points?
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How do I draw the arrow like in the first picture(the targeted phase-plane portraits )?
the targeted phase-plane portraits
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/145998/image.png)
my phase-plane portraits
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/145999/image.png)
Attached is the code for my phase portraits.
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Orion
le 6 Nov 2014
Hi,
Modifying your script phase_plane_example5, you could do something something like
clear
clc
X = [];
Y = [];
U = [];
V = [];
color = 'mrb';
for i=0:10:60
for j=-5:5:5
b = i;
a = j;
k = j/5+2;
[t,x] = ode45('mpac',0:0.01:10,[a/57.3;b/57.3]);
plot(a,b,'*k');
hold on;
plot(x(:,1)*57.3,x(:,2)*57.3,color(k));
% stock the positions.
X = [X,x(:,1)*57.3];
Y = [Y,x(:,2)*57.3];
% calculate and stock the derivatives.
U = [U,diff(x(:,1)*57.3)./diff(t)];
V = [V,diff(x(:,2)*57.3)./diff(t)];
end
end
title('Phase plane plot of roll dynamics');
xlabel('Roll angle(deg)');
ylabel('Roll rate(deg/s)');
grid on;
% add an initial line of values to the derivatives terms to have the same
% length vectors and match the position ones.
U=[zeros(1,21);U];
V=[zeros(1,21);V];
% draw the arrows.
quiver(X,Y,U,V);
3 commentaires
Orion
le 7 Nov 2014
Modifié(e) : Orion
le 7 Nov 2014
1) I inversed my concatenation : you must use
U=[U;zeros(1,21)];
V=[V;zeros(1,21)];
zeros is just used here to make the speed vectors of the same size of the position vectors.
2) if you want to play with the propoerties of the quiver plot (size for example)
q = quiver(X,Y,U,V);
set(q,'AutoScaleFactor',6);
as a result
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/179441/image.jpeg)
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