# Are MATLAB related questions allowed in dsp.se?

For example, is the following a valid question?

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

Can I use MATLAB butter(_) function?

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