'Decimation' Error in Simulink

Hi all,

I hope you are well. When I run my Simulink model, I met the issue 'The 'Decimation' option must be a positive integer'. Does anyone know why it occurs?

Thank you for your help.

Di

[Mathieu NOE]

well, you can resample with non integer values in matlab, but that is not doable in causal systems.

In simulink, decimation must always be performed with an integer decimation factor

look at the help

[di liu]

Hi Mathieu,

Thank you for your answer. The main issue is in Simulink, it does not tell me which block causes the error.

Answer 1

[Fangjun Jiang]

Follow the link of the error message to find the involved block. You must have provied an incorrect number for the "Decimation" parameter, which is a factor, n, which writes data at every nth time that the block executes. It's value must be a positive integer.

[di liu]

Hi Fangjun,

Thank you for your answer. As your suggestion, I am looking for where does the error come from. But as the following error window, it does not provide the detail information about the error. Do you have a better way to locate the error source?

[Fangjun Jiang]

It is weird it didn't tell the violating block.

Best way is to attach the model. If not, run the following code. 'f14' is a built-in example model. Observe the value and hopefully find the problematic block.

%%
f14;
blocks=find_system('f14','FollowLinks','On','LookUnderMasks','All','RegExp','On','Decimation','\w')
decimation=get_param(blocks,'Decimation')

[di liu]

Hi Fangjun,

Thank you for your help. I have found the issue, it is caused by the 'clock' block.