[x,y]=meshgrid(linspace(-5,5));
streamslice(x,y,y.*(4+x.^2-y.^2),-x.*(-2-x.^2+y.^2));
xlabel('x');ylabel('y');
clear;clc
[x,y]=meshgrid(linspace(-5,5));
streamslice(x,y,y.*(4+x.^2-y.^2),-x.*(-2-x.^2+y.^2),'noarrows');
xlabel('x');ylabel('y');
clear;clc
[x,y]=meshgrid(linspace(-5,5));
streamslice(x,y,y.*(4+x.^2-y.^2),-x.*(-2-x.^2+y.^2),'noarrows');
xlabel('x');ylabel('y');