control system bode plot

3 views (last 30 days)
Irshad Baruah
Irshad Baruah on 29 Mar 2020
Commented: Walter Roberson on 13 Apr 2020
how to plot this two equatio and the resutant output is shown in the figure
the alpha value should be any fractional value(eg-alpha=0.01 to 0.09).
one of the matlab community person helped me but his alpha value is 1 not fractional the code is given below
(hold off;
alpha=1;Wcr=10;
w1=logspace(-1,log10(Wcr),1000);w2=logspace(log10(Wcr),3,1000);
Mag1=20*ones(1,numel(w1));Mag2=@(w2) 20*alpha*log10(w2);
semilogx(w1,Mag1);hold on;semilogx(w2,Mag2(w2));grid on;xlabel('Frequency');ylabel('dB'))
  2 Comments
Irshad Baruah
Irshad Baruah on 29 Mar 2020
thanx ammer
Walter Roberson
Walter Roberson on 13 Apr 2020
Irshad Baruah:
If you believe that your question is unclear, then since you are the person who posted the question, you have the responsibility to clarify it.

Sign in to comment.

Accepted Answer

Ameer Hamza
Ameer Hamza on 29 Mar 2020
Edited: Ameer Hamza on 29 Mar 2020
Check this:
alpha=0.1; % alpha is 0.1
Wcr=10;
w1=logspace(-1,log10(Wcr),1000);
w2=logspace(log10(Wcr),3,1000);
Mag1=20*alpha*ones(1,numel(w1)); %<---- you need to multiply alpha here too
Mag2=@(w2) 20*alpha*log10(w2);
semilogx(w1,Mag1);
hold on;
semilogx(w2,Mag2(w2));
grid on;
xlabel('Frequency');
ylabel('dB')
Also try this to plot all values from 0.1 to 0.9 on one graph
Wcr=10;
w1=logspace(-1,log10(Wcr),1000);
w2=logspace(log10(Wcr),3,1000);
ax = axes('XScale', 'log');
hold on;
Alpha=0.1:0.1:0.9;
for i=1:numel(Alpha)
alpha = Alpha(i);
Mag1=20*alpha*ones(1,numel(w1));
Mag2=@(w2) 20*alpha*log10(w2);
semilogx(w1,Mag1);
semilogx(w2,Mag2(w2));
end
grid on;
xlabel('Frequency');
ylabel('dB');

More Answers (0)

Categories

Find more on Specifying Target for Graphics Output in Help Center and File Exchange

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!