How to set UIAxes min and max lim for plot in app designer ?

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farzad
farzad 2020-4-11
评论： ghaith hamdi 2021-11-3
Hi All
to set a min and max limit for my UIAxes in add designer I use :
ax=app.UIAxes;
ax.YLim([minlim,maxlim])
but I get the error :
Subscript indices must either be real positive integers or logicals.
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farzad
farzad 2020-4-13
not at all, I have already written the handle I used in the above comments. nothing about linkaxes. I took the derivative of the Y axis : since it was dispalcement and I wanted to have the velocity
farzad
farzad 2020-4-13
编辑：farzad 2020-4-13
my bad, I was defining the minumum and max before derivating, but doing the following lines. it gives the minimum of all the present signals in the UIAxes too smaller than the actual minimum. I mean, if I have 3 plots, the minimum of the 3 plots be -3 , with the following I get -40
minlim=0;
maxlim=0;
for i=1:numel(app.UIAxes.Children)
if minlim==0
minlim= min(app.UIAxes.Children(i).YData);
else
if abs(minlim)>abs(min(app.UIAxes.Children(i).YData))
minlim=min(app.UIAxes.Children(i).YData);
end
end
if maxlim==0
maxlim= max(app.UIAxes.Children(i).YData);
else
if abs(maxlim)<abs(max(app.UIAxes.Children(i).YData))
maxlim=max(app.UIAxes.Children(i).YData);
end
end
end
ax=app.UIAxes;
ax.YLim=[minlim,maxlim];

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采纳的回答

Adam Danz
Adam Danz 2020-4-13
编辑：Adam Danz 2020-4-13
It looks like what you want to do is
axis(app.UIAxes, 'tight')
Your current code does not give you the minimum of all plotted signals. It just gives you the minimum (and maximum) of the last plotted signal listed in app.UIAxes.Children since you're overwriting the minlim and maxlim values upon each iteration of the for-loops.
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farzad
farzad 2020-4-13
yes, I repeate it for another line and that gives the second derivative. but anyway, when I removed that first line or copied the values of second row to the first row, this problem vanishes. so I think it's not a problem of derivation

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更多回答（1 个）

Tommy
Tommy 2020-4-11
Use
ylim(ax, [minlim,maxlim])
instead.
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Tommy
Tommy 2020-4-12
You get an error? Or the limits don't change?
Are you able to post all of your code, or at least enough for us to plot what you are trying to plot?
farzad
farzad 2020-4-12
Well I differentiate the vertical axis. And the axis limits don't change from the original. Sorry that I can't put the whole code but I think I have been descriptive

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