Re: test this in matlab for my please

[Doug Stewart]

I am really having problems trying to get the same as Matlab.

I installed Scilab and started to compare my numbers with Scilab,

and they are much closer than matlab for this system.

I also noticed that Scilab's results are different than matlab's for all systems, then I found that matlab's results

have to be multiplied by the sampling frequency. see

http://www.mathworks.com/help/signal/ref/impinvar.html

"  Plot the digital impulse response, multiplying the numerator by a constant (Fs) to compensate for the 1/Fs gain introduced in the impulse response of the derived digital filter.  "

So even with this I can't get anything close to matlab for this one.

According to theory that I know ( I could be wrong))

this should plot a ramp after the initial startup curve.

Would someone try this on matlab and show me the plots, please.

 

s=tf('s')

T=.1

sys=1/(s*s*(s+1))

out2=c2d(sys,T,"impulse")

figure(1)

impulse(sys) %  should be the continuous time plot

figure(2)

impulse(out) %  should be the discrete  time plot