# Phase portrait of the system in a rectangle

1 view (last 30 days)
Stefani Stefanova on 26 Dec 2020
Commented: Ameer Hamza on 27 Dec 2020
The two above are a system
How to display the phase portrait of the system in a rectangle Including the special point /idk if special is the correct work in english/ and how to display a tangent vector to each of the displayed not special phase curves?
Stefani Stefanova on 26 Dec 2020
function PhasePortrait
clc;
%data:
[x,y] = meshgrid(linspace(-1,2,20));
dx = 2*x-y-5;
dy = 3*x-2*y-9;
quiver(x, y, dx, dy)
axis([-1 1 -1 1])
% hold on
quiver(x, y, dx, dy);
title('Phase portrait')
axis tight
%plot(x(1), y(-3), "Marker","*", "Color", 'b');
end
this is what ive written by when i try to mark my specific point (1, -3) it doesnt work

Ameer Hamza on 26 Dec 2020
You can use quiver(). For example,
[x,y] = meshgrid(linspace(-1,1,20));
dx = 2*x-y-5;
dy = 3*x-2*y-9;
quiver(x, y, dx, dy)
axis([-1 1 -1 1])
Ameer Hamza on 27 Dec 2020
I am glad to be of help!!!

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