Re: A problem with ilaplace()

[Doug Stewart]

Try this:

p=tf('s')

#a few simple calculations

Rgen=50;C1=100e-9;Rlast=50;

fg=10e3;

R1=1/(2*3*10e3*C1)-Rgen;

wg=2*3*fg;

#this works fine, Tp1 is a simple imagined example ...

Tp1=1/(5*p+6)

laplace1=1/p*Tp1

figure(1)

step(laplace1)

#this doesn't work, I don't understand that because Tp2 is the same

#as the example with other numbers

Tp2=1/(1+(Rgen+R1)/Rlast+p*C1*(Rgen+R1))

laplace2=1/p*Tp2

figure(2)

step(laplace2)

#since you have a pole at the origin then the output keeps getting larger.

#try this

figure(3)

step(Tp2)