this round(H.substitute(f=4).abs(),4) give same error again... then this: round(RDF(H.substitute(f=4).abs()),4) takes so much time, can't wait...
On Dec 9, 10:42 pm, Sand Wraith <[EMAIL PROTECTED]> wrote: > you mean for f? this: > > round(H.substitute(f=1),4) > > gives type error again :-( > > On Dec 9, 9:51 pm, Tim Lahey <[EMAIL PROTECTED]> wrote: > > > 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 Waterloohttp://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 -~----------~----~----~----~------~----~------~--~---
