From workspace in realtime

Hi.Can somebody tell me, how I can run a simulink block diagram in realtime, which only read data from some variable from Matlab workspace. And which block I have to use???

[Vieniava]

Quite interesting question (voted up)

Answer 1

[Paulo Silva]

Try this with the Matlab Fcn and a Display (or scope)

Matlab Fcn (evalin('caller','MyVar'))-------->Display

or just

Matlab Fcn (MyVar)-------->Display

Now go to your command line and execute MyVar=0, run the simulation with Simulation time Inf, open look at the display value so you can watch the values changing. Keep watching the display while you change the value of MyVar, it does change in real time (or almost). You can use other variable name than MyVar, just change the code inside the Matlab Fcn.

This is just one of the possible solutions.

Here's another but I won't recommend it, to test it do a model with a constant connected to one display, save it and start the simulation with final time Inf.

In one m file run this code:

for MyVar=1:10
set_param('ModelName/Constant','Value',num2str(MyVar))
pause(1);
end

The simulink display will count from 1 to 10 :)

[Vieniava]

very nice evalin() usage

[Paulo Silva]

The only bad part is that it doesn't do anything, I just tried without it and worked lol silly me :(

Answer 2

[Hristo Alexiev]

Thank you very much. I tried these approaches but the first didn't work. "Error: Real-Time Workshop Error in block: "untitled/MATLAB Fcn", block type "MATLABFcn": Not yet supported by Real-Time Workshop" The second approach is perfect and work flawlessly :)