MATLAB: Phase portrait of the system in a rectangle

curvesphase

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?

Best Answer

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])
Also see my answer here: https://www.mathworks.com/matlabcentral/answers/520864-how-to-plot-this-phase-portrait-correctly
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