num=[-10,1];
den=1;
bode(num,den);
hold on;
num=1;
den=[1,0,0];
bode(num,den);
num=1;
den=[1,1];
bode(num,den);
num=1;
den=[-0.1,1];
bode(num,den);

num=[-1000,100];
den=[-0.1,0.9,1,0,0];
bode(num,den);
legend('1-10s','1/s^2','1/(1+s)','1/(1-0.1s)','(1000s+100)/[s^2(-0.1s^2+0.9s+1)]');