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

Hi

How can I add a zoom in the peak of the curve like the attached one ?

Answer 1

[Star Strider]

Using these data with the code I provided in my Answer to your previous Question How can I insert a detail in the peak of the curve ?

The ‘V Vectors’ , ‘V_86’, ’V_89’, ‘V_91’, ‘V_92’, ‘V_95’, are provided in ‘Mallouli Marwa V Vectors.mat’, attached.

This Code —

omega = 125.6:0.1:502.4;
freq = omega./(2*pi);

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, freq,V_86,'g', freq,V_89,'k', freq,V_91,'m',freq,V_92,'c',freq,V_95,'b','LineWidth',2)
legend(ax1, 'FVF = 0.86','FVF = 0.89','FVF = 0.91','FVF = 0.92','FVF = 0.95');
xlabel(ax1,'Frequency [Hz]');
ylabel(ax1,'|Voltage FRF| [V/g]');

Lv = (freq>=45) & (freq<=52);
plot(ax2, freq(Lv),V_86(Lv),'g', freq(Lv),V_89(Lv),'k', freq(Lv),V_91(Lv),'m',freq(Lv),V_92(Lv),'c',freq(Lv),V_95(Lv),'b','LineWidth',2)
ax2.XTickLabel = [];
ax2.YTickLabel = [];
annotation('arrow',[0.37 0.56], [0.8 0.8])

Produces This Plot —

Experiment with my code to get different results.

[Mallouli Marwa]

Please how can I add the axis limits of the minure figure (detail) ?

[Image Analyst]

axis('on');

and you might want to play around with xlim() and ylim() like I mentioned below.

[Mallouli Marwa]

It's not clear.

Please add me the code exactly for my example?

[Mallouli Marwa]

I have adding

axis([45 52 40 60]);

But the axis still invisible.

Please help me.

[Star Strider]

To add axes tick labels to the small inset plot, just comment-out or delete these two lines:

ax2.XTickLabel = [];
ax2.YTickLabel = [];

Then the axes ticks and tick labels magickally appear!

The image you posted did not have axes ticks or tick labels on the inset plot, so I assumed that you did not want them in the inset plot. That is the reason I specifically eliminated them.

If you want to change the range of the x-axis limits in the inset plot, change the limits for the ‘Lv’ logical vector.

For example:

Lv = (freq>=46) & (freq<=50);

That is likely a bit closer to the image you originally posted.

Experiment with my code to get different results.

[Mallouli Marwa]

I have added this code

ax2.XTickLabel = [45 52];
ax2.YTickLabel = ([50 60]);

But I have obtained this figure

[Image Analyst]

That's not right. There are more tickmarks than you set tick labels so it ended up repeating them. Use the functions xticks() and xticklabels() and pass in the tick marks you want. You may not have to use xticklabels if you are happy with just the numbers (the defaults that xticks will put up).

[Star Strider]

To use those x-values, ‘Lv’ has to change to

Lv = (freq>=45) & (freq<=52);

The y-tick values you want are not appropriate. If you look at the main plot, and use the data cursor to see the coordinate values, you will verify that the y-tick labels in the inset plot are correct. I suggest that you leave them at:

Lv = (freq>=46) & (freq<=50);

to get the best results, and just let MATLAB calculate the y-tick values. It does that correctly. The inset plot looks different because of its aspect ratio. You can change that, however the peaks would then appear squashed together as in the original plot, so nothing would be gained.

[Bjorn Gustavsson]

This looks like a bit of work. With the FEX-link I provided below this becomes easier - someone has made the work and bundled it up.

[Star Strider]

I adapted it from an example in the axes function documentation. It took a few minutes, and I learned something!

[Mallouli Marwa]

How can I broaden the scale of the detail figure to make it more visible ?

[Star Strider]

Experiment with the Position limits:

ax2 = axes('Position',[0.25 0.65 0.15 0.20]);

Remember that they are respectively [left bottom width height]. If you want to increase the width, increase elment 3, perhaps:

ax2 = axes('Position',[0.25 0.65 0.20 0.20]);

I did not test that to see what it looked like. It may also be necessary to adjust the annotation arrow.

Answer 2

[Bjorn Gustavsson]

My prefered tool for this is: on-figure-magnifier - at the moment, my preferences vary since you can find a range of similar tools if you search for "magnify" on the file exchange.

HTH

Answer 3

[Image Analyst]

See my demos that allow you to put insets of images or plots into other images or plots. When you plot the inset, change xlim and ylim to zoom in on the part your want to enlarge.

[Mallouli Marwa]

Thanks good examples.