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Butterworth filter design

`[`

designs
a lowpass, highpass, bandpass, or bandstop Butterworth filter, depending
on the value of `b,a`

] = butter(`n`

,`Wn`

,`ftype`

)`ftype`

and the number of elements
of `Wn`

. The resulting bandpass and bandstop designs
are of order 2`n`

.

**Note:** See Limitations for information about numerical issues that affect
forming the transfer function.

`[`

designs
a lowpass, highpass, bandpass, or bandstop digital Butterworth filter
and returns its zeros, poles, and gain. This syntax can include any
of the input arguments in previous syntaxes.`z,p,k`

] = butter(___)

`besself`

| `buttap`

| `buttord`

| `cheby1`

| `cheby2`

| `designfilt`

| `ellip`

| `filter`

| `maxflat`

| `sosfilt`

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