How do you stop a MATLAB GUI from clearing axes between plot commands?

Question

James Floyd 2022-5-25

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编辑： Gavin 2022-10-20

I have a GUI that I'm using to place initial locations for a 6DOF sim. I want the points to use different markers (a red circle and a gray triangle), but every time I use two plot3 commands, the GUI plots the first then clears and plots the second. I'm using the hold on ... hold off command. Is there a way to fix this or use one command?

Here's what happens after the 'Place' button is pressed:

Code for reference:

hold on
plot3(app.UIAxes,missile_init_x,missile_init_y,...
    missile_init_alt,'ko','MarkerSize',15,'MarkerFaceColor',...
    'r') % <--------- Some form of clear/reset happens here
plot3(app.UIAxes,target_init_x,target_init_y,0,'kv',...
    'MarkerSize',20,'MarkerFaceColor',0.5*[1 1 1])
hold off

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Answer 1

Image Analyst 2022-5-25

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在 MATLAB Online 中打开

Is it possible your missile and target coordinates are exactly overlapping? Or are in line with each other from that point of view so that you see only the closest one? Do you see both if you rotate the axes? This seems to work fine:

missile_init_x = -1000;

missile_init_y = -1000;

missile_init_alt = 2000;

target_init_x = 1000;

target_init_y = 1000;

hold on

plot3(missile_init_x,missile_init_y,...

missile_init_alt,'ko','MarkerSize',15,'MarkerFaceColor',...

'r') % <--------- Some form of clear/reset happens here

plot3(target_init_x,target_init_y,0,'kv',...

'MarkerSize',20,'MarkerFaceColor',0.5*[1 1 1])

grid on;

view(500, 500)

hold off

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James Floyd 2022-5-25

That works in regular MATLAB, but in the GUI, it doesn't which is the most confusing part of all of this.

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Answer 2

Gavin 2022-10-20

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https://ww2.mathworks.cn/matlabcentral/answers/1726890-how-do-you-stop-a-matlab-gui-from-clearing-axes-between-plot-commands#answer_1079763

编辑：Gavin 2022-10-20

Encountered the same issue myself, ended up fixing it by setting

app.UIAxes.NextPlot = 'add'

in my startupFcn

and then juggling the intended clearing behavior with

cla(app.UIAxes)

To figure this out, I ran my app from the command window like

app = AppCommand(appParam1, appParam2,...)

and then going into the variable explorer and poking around the properties of app.UIAxes, which seem to be fairly intuitively named. Hope this solves your issue!