How to plot data in Matlab from workspace (Simulink)

Question

Jimmy Neutron 2020-11-12

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评论： Ameer Hamza 2020-11-13

Dear all,

I am currently trying to create a real-time scatter like plot (I want to plot individual points or markers, with which I will later do calculations (finding the mean etc)). My current method of trying is to send the values I have in Simulink to Matlab using the "to Workspace" blocks that I renamed x and y:

I have created a test. file, which includes the following lines:

x = out.x.data;
y = out.y.data;
scatter(x,y)
drawnow
pause(.5)

Unfortnately, nothing is working. I am trying to update the x and y coordinates and plot these two points, but cannot manage it. Can someone please help me?

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Answer 1

Ameer Hamza 2020-11-12

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在 MATLAB Online 中打开

You have written 'get' instead of 'out'

x = get.x.data;
   %^ replace it with out

Apart from that, your code is correct.

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Jimmy Neutron 2020-11-12

my bad, that was a typo. It still does not work unfortunately. I am not stopping the simulink and that m ight be causing problems, but Ii want to update the graph after every 0.3 seconds...

Ameer Hamza 2020-11-13

So you are trying to plot the data while simulink is running? In that case, you will need to use event listeners. For example see this: https://blogs.mathworks.com/simulink/2013/01/25/accessing-block-data-during-a-simulation/

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Answer 2

Sara Nadeau 2020-11-12

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Hello,

I believe that the data logged to the workspace is only available after you pause a simulation and when a simulation completes.

If you're working with a version of Simulink that is R2018b or later, you can use a data access callback function to plot data during the simulation: Access Data in a MATLAB Function During Simulation.

Hope this helps!