Get sample rate in a Matlab function block in Simulink

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If i use MATLAB function block in a Simulink project, is there a way of determining the sample rate in the code in that block? If I use a MATLAB System block, I can use getSampleTime(obj).SampleTime to give me the time for a frame and then use the frame size to give me the time for a sample, but that won't work for a MATLAB function block. I'd like to use the MATLAB function block if possible because the coding is simple. Is there a way to get the sample rate or am I stuck using a MATLAB system block?
  4 Comments
Glenn Kubota
Glenn Kubota on 28 Dec 2021
Yes, the sample time is inherited from the audio signal in this case. I'm just trying to determine what that sample time is from my MATLAB function code. It seems there may not be a way of doing this. The suggestion from jibrahim may be the only way that I can do this.

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Answers (2)

jibrahim
jibrahim on 28 Dec 2021
Hi Glenn,
I've accomplished this in the past using a probe block:
That block can output a vector representing the sample time. You should be able to feed this value to your MATLAB function block (as an input) and use the value.
  2 Comments
jibrahim
jibrahim on 28 Dec 2021
You might be able to accomplish this by calling simulink.block.getSampleTimes inside the MATLAB function block:
However, that function does not generate code, so you will have to use it in conjunction with coder.extrinsic and coder.const. I think using a probe block is much more straightforward.

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Salman Ahmed
Salman Ahmed on 31 Dec 2021
Hi Glenn,
You could also use the following workaround to access the sample rate inside the MATLAB function block:
coder.extrinsic('get_param');
sampleTime=str2double(get_param('s1/MAT','SystemSampleTime'));
Here s1 is the Simulink model name, MAT is the name of the MATLAB function block.

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