MATLAB Answers

How can I insert a detail in the peak of the curve ?

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Mallouli Marwa
Mallouli Marwa on 28 Aug 2020
Commented: Star Strider on 30 Aug 2020
Hi
How can I insert a detail in the peak of the curve like the attached curve ?
omega = 125.6:0.1:502.4;
freq = 2*pi*omega;
figure (1)
plot (freq,V_86,'g', freq,V_89,'k', freq,V_91,'m',freq,V_92,'c',freq,V_95,'b','LineWidth',2);
legend('FVF = 0.86','FVF = 0.89','FVF = 0.91','FVF = 0.92','FVF = 0.95');
xlabel ('Frequency [Hz]');
ylabel('|Voltage FRF| [V/g]');

Answers (2)

Serhii Tetora
Serhii Tetora on 28 Aug 2020
use function axes for zommed peak. you can define those Position and Limits.
and annotation('arrow') for arrow.

Star Strider
Star Strider on 28 Aug 2020
Experiment with this:
f = @(w,c) 1./(w.^2 + 10*w - c+50);
w = linspace(20,80,250);
c = (0.1:0.2:0.9).';
figure
ax1 = axes('Position',[0.2 0.1 0.7 0.8]);
ax2 = axes('Position',[0.25 0.65 0.15 0.2]);
plot(ax1, w, f(w-50,c))
Lv = (w>=43) & (w<=47);
plot(ax2, w(Lv), f(w(Lv)-50,c))
ax2.XTickLabel = [];
ax2.YTickLabel = [];
annotation('arrow',[0.37 0.48], [0.8 0.8])
producing:
This should get you started. You can use this code with your own data and adjust it to present the plot you want. (You will have to experiment with it.)
See the documentation on axes and annotation for details.
  2 Comments
Star Strider
Star Strider on 28 Aug 2020
My code runs for me without error (in R2020a). I cannot reproduce the error you reported.
You need to adapt my code to your data and curves. I am simply making it easier for you, so all you need to do is to adapt your vectors to use my code.

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