On Dec 9, 2008, at 1:46 PM, Sand Wraith wrote:
> > thank you! )) > > but I need to use my values, now just variables (Ts,Pole1 etc) > > I was trying this: > > r=2*2*pi > Pole1=r*exp(I*2*pi/3) > Pole2=-r > Pole3=r*exp(-I*2*pi/3) > Ts=0.1 > > z = exp(I*2*pi*Ts*f) > p = (2/Ts)*(z-1)/(z+1) > H = (p^3)/((p-Pole1)*(p-Pole2)*(p-Pole3)) > show(H) > > show() works fine, but if i want to use H function now: > > round(H(4).abs(),5) > > a have got "Type error" message :-\ >> H as you've defined it isn't a function, it's an expression. Check the type so H(4) doesn't mean anything. You could try subs and substitute for p (I assume that's what you want evaluated at 4. Cheers, Tim. --- Tim Lahey PhD Candidate, Systems Design Engineering University of Waterloo http://www.linkedin.com/in/timlahey --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
