How do I plot individual points on an existing graph

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Matthew Orsie
Matthew Orsie 2017-11-13
评论： Star Strider 2017-11-13
%Define Values
d = [ 0.25, 0.5 , 1 , 1.5 , 2 ];
m = 1;
k = 1;
omeganought = 1;
omega = linspace (0, 2);
%Creating a graph for all damping values
for k1 = 1:length(d)
FA(k1,:) = 1 ./ sqrt ( power(m,2)*power((power(omeganought,2)-power(omega,2)),2) + power(d(k1),2)*power(omega,2));
end
%Plotting points (omega_d, M(omega_d))
%plot graph
plot (omega, FA)
%Labels
xlabel ('Frequency');
ylabel ('Frequency response');
Title ('Frequency response curve')
So, My question is asking me to plot the points (omega_d, M(omega_d)). These points represent the maximum gain for each damping factor 'd'. I think it just wants me to put points on the Max of each curve and I'm not sure how to do so. Any help is appreciated.

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采纳的回答

Star Strider
Star Strider 2017-11-13
Only three have definable peaks.
That said, this works:
%Define Values
d = [ 0.25, 0.5 , 1 , 1.5 , 2 ];
m = 1;
k = 1;
omeganought = 1;
omega = linspace (0, 2);
%graph
for k1 = 1:length(d)
FA(k1,:) = 1 ./ sqrt ( power(m,2)*power((power(omeganought,2)-power(omega,2)),2) + power(d(k1),2)*power(omega,2));
[Peak{k1},Omga{k1}] = findpeaks(FA(k1,:), omega);
end
%plot graph
figure(1)
plot (omega, FA)
hold on
plot([Omga{:}], [Peak{:}], '^r', 'MarkerFaceColor','r')
hold off
I am not certain how you want to handle the last two.
  2 个评论
Matthew Orsie
Matthew Orsie 2017-11-13
We're given what the graph is supposed to look like, and there's a dotted line going through the middle at omega = 1. It doesn't make much sense to me because it doesn't go through all of the peaks
Star Strider
Star Strider 2017-11-13
You can plot a vertical line at omega=1 with:
%plot graph
figure(1)
plot (omega, FA)
hold on
plot([Omga{:}], [Peak{:}], '^r', 'MarkerFaceColor','r')
plot([1 1], ylim, '--')
hold off
Plotting a vertical line there is a mystery to me, too, especially since the peak of the first curve is at 0.990, not 1. (It’s the second plot call in the hold block.)

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