# What's my error trying to plot

4 views (last 30 days)
Lauren Fuentes on 30 Jun 2020
Commented: Lauren Fuentes on 1 Jul 2020
Fs = 100;
t = (1:100)/Fs;
s1 = sin(2*pi*t*5); s2=sin(2*pi*t*15); s3=sin(2*pi*t*30);
s = s1+s2+s3;
[b,a] = ellip(4,0.1,40,[10 20]*2/Fs);
[H,w] = freqz(b,a,512) and plot(w*Fs/(2*pi),abs(H));
sf = filter(b,a,s);
S = fft(s,512);
SF = fft(sf,512);
w = (0:255)/256*(Fs/2);
plot(w,abs([S(1:256)' SF(1:256)']))
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Lauren Fuentes on 1 Jul 2020
Thanks for the clarification, I'll make sure to do so next time around...

Gurpreet Singh on 30 Jun 2020
Hi Lauren,
This error is occurring because of line 6. There should be delimeter instead of "and".
It should be as follows.
Fs = 100;
t = (1:100)/Fs;
s1 = sin(2*pi*t*5); s2=sin(2*pi*t*15); s3=sin(2*pi*t*30);
s = s1+s2+s3;
[b,a] = ellip(4,0.1,40,[10 20]*2/Fs);
[H,w] = freqz(b,a,512) ; plot(w*Fs/(2*pi),abs(H));
sf = filter(b,a,s);
S = fft(s,512);
SF = fft(sf,512);
w = (0:255)/256*(Fs/2);
plot(w,abs([S(1:256)' SF(1:256)']))

SC on 30 Jun 2020
is the error you are getting:
"Invalid expression. Check for missing multiplication operator,
missing or unbalanced delimiters, or other syntax error. To
construct matrices, use brackets instead of parentheses." ?
This maybe because of 'and' in your code at line:6
Try the following:
Fs = 100;
t = (1:100)/Fs;
s1 = sin(2*pi*t*5); s2=sin(2*pi*t*15); s3=sin(2*pi*t*30);
s = s1+s2+s3;
[b,a] = ellip(4,0.1,40,[10 20]*2/Fs);
[H,w] = freqz(b,a,512);
plot(w*Fs/(2*pi),abs(H));
sf = filter(b,a,s);
S = fft(s,512);
SF = fft(sf,512);
w = (0:255)/256*(Fs/2);
plot(w,abs([S(1:256)' SF(1:256)']))
Lauren Fuentes on 30 Jun 2020
Thank you so much!

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