Warning in hold and legend commands in appdesigner

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Anum Ahmed Pirkani 2021-1-27

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https://ww2.mathworks.cn/matlabcentral/answers/728673-warning-in-hold-and-legend-commands-in-appdesigner

评论： Anum Ahmed Pirkani 2021-1-29

Hello,

Since a few days, I am getting a warning saying 'Specify a UIAxes Handle as first argument' on certain commands associated with the plot functions in appdesigner. These warnings did not appear a couple of months ago, I am just wondering is it due to any update? I am currently using Matlab2020b version.

An example is given below for polar plot. I am getting the same warnings on lines 3,5 and 6.

app.pax = polaraxes(app.Ant_Pat); % Creates polar axes inside the panel

polarplot(app.pax,deg2rad(app.Azimuth_V(600:3000)),pow2db(app.G_ta_v(1800,600:3000)),'g','LineWidth',2);

hold(app.pax,'on'); %getting warning

polarplot(app.pax,deg2rad(app.Azimuth_V),pow2db(app.G_ra_v(1800,:)),'r','LineWidth',2);

legend(app.pax,{'Transmit Antenna','Receive Antenna'},'Location','south'); %getting warning

legend(app.pax,'boxoff') %getting warning

Is there any replacement command in order to avoid these warnings?

Kind Regards

Anum

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Walter Roberson 2021-1-28

在 MATLAB Online 中打开

As an experiment, try

app.pax = polaraxes(app.Ant_Pat);                                                        % Creates polar axes inside the panel
class(app.pax)
isgraphics(app.pax)
polarplot(app.pax,deg2rad(app.Azimuth_V(600:3000)),pow2db(app.G_ta_v(1800,600:3000)),'g','LineWidth',2);
isgraphics(app.pax)
class(app.pax)

I am just wondering if the polarplot() is somehow deleting or changing the axes

Anum Ahmed Pirkani 2021-1-29

Its still the axis before and after the polar plot. 'matlab.graphics.axis.PolarAxes'

The warning is hidden after enabling app coding alerts tough.

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Answer 1

Mario Malic 2021-1-28

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/728673-warning-in-hold-and-legend-commands-in-appdesigner#answer_608203

I think this happens when you use UIFigure or regular Figure that doesn't exist as the Component in the app. What is app.Ant_Pat? See this question, if you specify Panel as the parent of the polarplot, you might not get the warning.