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

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]');

[Star Strider]

See: How can I add a zoom in the peak of the curve ?

Answer 1

[Serhii Tetora]

use function axes for zommed peak. you can define those Position and Limits.

and annotation('arrow') for arrow.

[Mallouli Marwa]

Please help me and add me the code.

Answer 2

[Star Strider]

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.

[Mallouli Marwa]

I have obtained this error below.

Please help me.

Error using -

Matrix dimensions must agree.

Error in Plot_detail>@(w,c)1./(w.^2+10*w-c+50)

Error in Plot_detail (line 9)

plot(ax1, w, f(w-50,c))

[Star Strider]

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.