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How to freeze the range of y-axis on an axes on gui?

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MatlabNewbie01232015
编辑： Dario Mangoni 2018-12-11
I am trying to plot the time audio signal using plot(handles.axes1, x) which works fine. The problem is that I cannot make the make the range of a y-axis fix at [-1 1]. I try to set the YLim to be [-1, 1], and YLimMode to be 'manual' both in property windows settings using gui and also in callcall back

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回答（3 个）

Dario Mangoni
Dario Mangoni 2018-12-11
编辑：Dario Mangoni 2018-12-11
Currently (at R2018b) this operation is made easy through 'axis manual' command.
figure;
hold on;
plot(1,1,'+')
plot(2,2,'+')
axis manual
plot(50,50,'+')
The point (50,50) is not in view because axis limits has been retained.
See axis documentation for more options.
Matt J
Matt J 2015-8-28
编辑：Matt J 2015-8-28
It is not enough to set YLimMode to 'manual'. You need to apply "hold on" as Geoff mentioned. However, you can still use CLA to clear the plot between re-renderings, like in the example below.
axis([0,11,-1,1]);
h=gca;
hold on
h.YLimMode='manual';
for i=1:100,
plot(1:10,rand(1,10));
pause(.3);
drawnow
cla
end
hold off
Geoff Hayes
Geoff Hayes 2015-2-2
Try using ylim which will allow you to set the y-axis limits. In your case, you could do something like
ylim(handles.axes1,[-1 1]);
In order to keep these limits, you may need to call
hold(handles.axes1,'on');
so that you return the current properties of the axes before a new plot is added to it.
  2 个评论
MatlabNewbie01232015
MatlabNewbie01232015 2015-2-3
Thank for helping me out. The problem is the plot becomes a mess because I try to display the output of an audio file segment by segment. Is there anyway I can clear what on the plot but still keep the axes' range?
Geoff Hayes
Geoff Hayes 2015-2-4
Why not just replace the x and y data from the previous segment? Something like
% plot the first segment
h = plot(x,y);
% use the handle from plot, h, to update with the new segment data
set(h,'XData',xNewSeg,'YData',yNewSeg);
where xNewSeg and yNewSeg are the x and y data from the new segment.

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