Control package

The control package is part of the Octave Forge project.

Function list

Linear System Representation

Title	Chapter	Function	Implemented	File	Status
Basic Models	tf	yes

Some very basic examples

PT1/low-pass filter step response

Code: Creating a transfer function and plotting its response

T1=0.4; # time constant P=tf([1], [T1 1]) # create transfer function model step(P,2) # plot step response #add some common markers like the tangent line at the origin, which crosses lim(n->inf) f(t) at t=T1 hold on plot ([0 T1], [0 1],"g") plot ([T1 T1], [0 1],"k") plot ([0 T1], [1-1/e 1-1/e],"m") hold off

Try also bode(P)! (a first order low-pass filter has -3db magnitude at f=1/T1)