Create subplots inside a subplot

[Lukas Reichlin]

Dear Octave Community

How can I create a subplot inside a subplot?

In the attached PDF, the plot should be created by

subplot (2, 2, 1)
bode (sys)
subplot (2, 2, 2)
impulse (sys)
subplot (2, 2, 3)
nyquist (sys)
subplot (2, 2, 4)
step (sys)

where inside the bode function (of the control package), I need to call a 
function which subdivides subplot 1 into two plots; one for magnitude and one 
for phase. How can I do this?

Thanks in advance for any help and best regards,
Lukas

MATLAB.pdf
Description: Adobe PDF document