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

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farzad 2020-4-11

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评论： ghaith hamdi 2021-11-3

采纳的回答： Adam Danz

在 MATLAB Online 中打开

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 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 2020-4-13

编辑：farzad 2020-4-13

在 MATLAB Online 中打开

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 2020-4-13

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https://ww2.mathworks.cn/matlabcentral/answers/517199-how-to-set-uiaxes-min-and-max-lim-for-plot-in-app-designer#answer_425755

编辑：Adam Danz 2020-4-13

在 MATLAB Online 中打开

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 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