how to plot magniture and phase response of a filter?

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LeBron
LeBron 2013-4-10
Hey everyone heres the question: http://img42.imageshack.us/img42/3236/capturezih.jpg I cant seem to get the plots to work
Heres my matlab code
w=0:0.001:pi;
Hw=(0.1*(exp(1j*w)-1))/(exp(1j*w)+0.8);
figure (1)
subplot (2,1,1)
plot(w,abs(Hw))
subplot (2,1,2)
plot(w,angle(Hw))

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回答（2 个）

Teja Muppirala
Teja Muppirala 2013-4-10
You need to do elementwise division, use "./" instead of "/"
Hw=(0.1*(exp(1j*w)-1))./(exp(1j*w)+0.8);
  1 个评论
LeBron
LeBron 2013-4-10
thx for replying that worked.
One more question related to the same question: http://img23.imageshack.us/img23/7905/capturelc.jpg
if true
n=1:5:100;
x=cos(15*pi*2/16)+ 2;
figure (2)
subplot(2,1,1)
stem(n,x)
ylabel('x(n)')
y=filter([
subplot(2,1,2)
stem(n,y)
ylabel('y(n)')
xlabel('n')
end
just not sure what to use in yfilter part. thx

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LeBron
LeBron 2013-4-11
i hope someone replies thx

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