Keep the graphic's zoom

Hi,

I would like to know how I can keep the zoom of graphic when I will go to change the variable that I'm watching at the moment.

thanks

regards

[Andrew Newell]

By "changing the variable", do you mean replotting with new values?

[Mtlb Usr]

Hi Andrew,

No exactly. I have got a multiple Y axis variable 2D graphic and when I want to change the current y axis I have got a popupmenu to select other variable.

When I changed the variable there isn't a new plot. Instead of this there is a axis change.

Do you understand me?

thanks

regards.

[Andrew Newell]

I think so. Do you want to preserve the axes limits or the scale? (In other words, if your X axis limits are [3 5] after zooming, do you want to keep it at [3 5] or [Xlower Xlower+2]?)

[Mtlb Usr]

Hi Andrew,

OK,for now I want to preserve the axis limits after zooming and then when I changed Y axis variable to keep these limits.

regards

[Mtlb Usr]

Hi Andrew,

Finally, do you know how I can preserve the axis limits after zooming?

thanks

regards

[Jan]

Please anser my question. Keeping the limits and zooming is a contradiction. Therefore you cannot do both.

Answer 1

[Jan]

Another approach:

y1 = rand(1, 100);
y2 = rand(1, 200) * 2;

AxesH = axes('NextPlot', 'add');
Plot1H = plot(y1);

pause(2.0);
set(AxesH, 'XLimMode', 'manual', 'YLimMode', 'manual');
Plot2H = plot(y2, 'r');

Or you can replace the XData and YData of the plotted line directly instead of the last line:

set(Plot1H, 'XData', 1:200, 'YData', rand(1, 200));

[Mtlb Usr]

Hi Jan,

If I understand you well, you said to me that if I changed XData & YData properties respectively I would maintain the zoom after changing the variable.

Am I right?

regards

[Jan]

What is "the zoom" and how can it be maintained?

The shown method fixes the X- and Y-limits.

[Mtlb Usr]

Hi Jan,

I have looked your comment.

Then, I'm interested in keeping the zoom. How can I do it?

regards

[Jan]

Let me try it again: What is "keeping the zoom"? This is simply no well defined term and you have to explain it, before we can help you.

If you want to fix the axis limits, the above shown code does it already: "set(AxesH, 'XLimMode', 'manual')".

Have you tried to run the shown code? Does it solve your problem? Did problems occur? Which? Do the results differ from your expectations? If so, describe the differences.

[Mtlb Usr]

Hi Jan,

Sorry, I haven't realized.

Well, When I said keeping the zoom is that keeping the zoom that I have applied over one variable when I decide to change for other variable.

Do you understand me now?

regards

[Jan]

Perhaps I understand. Did you try my code?

[Mtlb Usr]

Hi Jan,

I have could resolve the issue.

I had the answer in frot of me...

The solution has been put the keeplimits arg when I call datetick function.

Sometimes, I think that when you are thinking that you have a big problem, really it's not true because you have a very simple solution for this.

However, thank you for trying to help me.

regards

Answer 2

[Andrew Newell]

If I understand your question, you can do something like the following. Make your first plot, for example

plot(1:10)

Zoom in, and then save the values of axis:

v = axis;

Finally, make your next plot and set the axis values.

plot(3:5)
axis(v)