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For example, is the following a valid question?

Which function can I use to implement the following filter in MATLAB?

enter image description here

Can I use MATLAB butter(_) function?

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Yes, I think it's fine... except that you should probably explain a bit more about why you think butter() will do that job.

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  • $\begingroup$ What about asking questions about Image Processing programs written in MATLAB? $\endgroup$
    – user23572
    Jan 5 '17 at 14:27
  • $\begingroup$ Well, it depends on whether the question is about the algorithm implemented or about MATLAB. In general, MATLAB questions are better to be answered on StackOverflow itself. There's a grey area there, though, so feel free to ask on SE.SP --- but if it's closed I'm happy to migrate it to SO if that's what people think. $\endgroup$
    – Peter K. Mod
    Jan 5 '17 at 14:49
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    $\begingroup$ My answer to your original question is the same: if the question is about the algorithm used by butter then that's fine here. If the question is about how to use the parameters of butter then that's more of a SO question an an SP question. $\endgroup$
    – Peter K. Mod
    Jan 5 '17 at 14:50

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