My quiver plot seems to go flat when I am plotting a coupled ode.

So the ODE system reads:

and my code reads:

[x, y]=meshgrid(-2:0.6:4)
dx = 3*(x-1)*y;
dy = 2-x-y^2;
quiver(x, y, dx, dy, 'r')

startx = -5:0.9:5;
starty = -2:0.6:5;
streamline(x,y,dx,dy,startx,starty)

Which Gives:

I'm a bit stuck because this is the plot I am supposed to get:

Answer 1

[Asvin Kumar]

I believe, while trying to compute dx and dy, you intended to find the elementwise product using the matrices of x and y. Try the following code instead with changes in lines 2 & 3.

[x, y]=meshgrid(-2:0.6:4) 
dx = 3*(x-1).*y; 
dy = 2-x-y.^2; 
quiver(x, y, dx, dy, 'r', 'AutoScaleFactor', 2) 
startx = -5:0.9:5; 
starty = -2:0.6:5; 
streamline(x,y,dx,dy,startx,starty) 

Modify the property ‘AutoScaleFactor’ to change the size of the arrows.

The code given above should produce the following output.