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Simulink: Update figure in matlab function

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Gabriel
Gabriel 2024-1-12
评论： Gabriel 2024-1-13
Hello,
i am trying to update a figure which is created in the InitFcn Callback, with another Matlab function in Simulink.
My InitFcn Callback runs a m file in which the figure is created and a first plot is made. I save this plot to a global variable.
During the simulation the x,y,z data of my plot is updated and i want do draw it in real time. So i tried to update the plot command with "set" command in another matlab function.
Background: It's a 6-DOF (Stewart) platform for a flight simulator and i want to draw the position of the platform in this figure. The position is read from a flight simulator program.
The Problem: I don't know how to update the plot in another matlab function. Or basically i don't know how to make an variable (which i created in the InitFcn m file) in another matlab function accesable.
figure_init.m creates the figure and make a first plot:
and in this function the plot should be updated:
Thank you for your suggestions!

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回答（1 个）

Fangjun Jiang
Fangjun Jiang 2024-1-12
This could work. The key is to declare a global variable in both the figure_init() function and update_plot() MATLAB Function block. You need to turn on hold, not sure how the figure would be refreshed though during simulation.
global fig;
fig=figure(1); hold on;
What I think you really need is this.
stream signal data to a MATLAB® callback function during simulation
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Fangjun Jiang
Fangjun Jiang 2024-1-12
编辑：Fangjun Jiang 2024-1-12
It works. No need to use global variable. Just make sure all figures are closed before model simulation. If you really want to make it robust, I think you can use global variable to pass the figure number. In that case, you don't need to close or worry about other figures. Fig1=findobj(0,'type','figure','Number',GlobalFigureNumber);
%figure_init
figure(1);plot(1:3);xlim([1 10]);ylim([1 10]);
function y = update_plot(u)
Fig1=findobj(0,'type','figure');
Line1=findobj(Fig1,'type','line');
set(Line1,'XData',1:u,'YData',1:u);
y = u;
u is a digital clock thus its value is 1 at time 1, 2 at time 2, ... I see the figure line increasing as the simulation runs.
Gabriel
Gabriel 2024-1-13
Yes i think that works!
Thank you very much.

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