How to send one array element at a time to a subsystem every 0.5 seconds in Simulink?

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Ben Navon
Ben Navon 2025-4-14
评论： Mathieu NOE 2025-4-16
Hi all, I'm working on a Simulink model where a MATLAB Function block outputs an array of control commands (the command array is generated once at the start of simulation). I’d like to send one command at a time from this array to a subsystem input, with a rate of 2 Hz (i.e., one value every 0.5 seconds).
What’s the best way to implement this?
Thanks in advance!
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Ben Navon
Ben Navon 2025-4-16
@Mathieu NOE I'm getting this error from the Unbuffer block:
Error:Error in 'go2_pp/Unbuffer': All sample times must be discrete. No continuous or constant sample times are allowed.

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Fangjun Jiang
Fangjun Jiang 2025-4-14
Nothing special. Use a Counter block (free-running or limited) in combination with the model solver setting to provide the step (every 0.5 second). Feed it to this function.
function y = fcn(u)
persistent cmd
N=10;
if isempty(cmd)
cmd=zeros(N,1);
end
if u==0
cmd=10*(1:N);
y=0;
elseif u>=N
y=cmd(N);
else
y=cmd(u);
end
end
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Ben Navon
Ben Navon 2025-4-16
Thanks for your response! I'm not sure I fully understand the architecture you're recommending.
What exactly should I feed into your function? Where should the function's output be connected?
For context, here is my current model:
  • The MATLAB Function block (which generates the commands vector) is inside an Enabled Subsystem.
  • I'm using a Counter block with a 0.5 [s] sample time (default 16-bit).
  • The Rate Transition block has its output port sample time set to 0.5 [s].
  • My simulation duration is 60 seconds.
Model solver settings:
Also, I'm getting this error from the Unbuffer block:
Error:Error in 'go2_pp/Unbuffer': All sample times must be discrete. No continuous or constant sample times are allowed.
Fangjun Jiang
Fangjun Jiang 2025-4-16
Feed the Counter block to the MATLAB Function block input.
The function output is the "one array element at a time".

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