function A=randM
%  A=randM
% generates a random 2 by 2 matrix with
% interesting phase portraits
	u=rand;S=randn*eye(2);
	B=randn*[0 1;-1 0]+S;
	C=.5*randn*[0 1;1 0]+S;
	d=randn;D=[0 1;-d*d 2*d];
	A=(u<1/3)*B+(u>1/3)*(u<2/3)*C+(u>2/3)*D;
	T=5*eye(2)+randn(2,2);A=.7*inv(T)*A*T;