Hi all! Please help me to replace variables:
I have this function:
H(p)=(p^3)/((p-Pole1)*(p-Pole2)*(p-Pole3))
where Pole1,Pole2,Pole3 - complex:
r=2*2*pi
Pole1=r*exp(I*2*pi/3)
Pole2=-r
Pole3=r*exp(-I*2*pi/3)
Ts=0.1
And I need to make a few replaces:
need to replace "p" with "(2/Ts)*(z-1)/(z+1)", where z is a new
variable, and then replace "z" with "exp(I*2*pi*Ts*f)". To have H(f)
function at the end.
I am trying to write:
z=exp(I*2*pi*Ts*f)
p=(2/Ts)*(z-1)/(z+1)
H=(p^3)/((p-Pole1)*(p-Pole2)*(p-Pole3))
and now if I want to look at H:
H
or
show(H)
I've got many errors...
tail of long output:
<sage-display>
stdin:16:Incorrect syntax: Syntax error
_tmp_ : (8000.0(
^
<sage-display>(%o90)
what is wrong with it?
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