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Filter order

returns
the filter order for the filter specified by the second-order sections
matrix, `n`

= filtord(`sos`

)`sos`

. `sos`

is a *K*-by-6
matrix. The number of sections, *K*, must be greater
than or equal to 2. Each row of `sos`

corresponds
to the coefficients of a second-order filter. The *i*th
row of the second-order section matrix corresponds to ```
[bi(1)
bi(2) bi(3) ai(1) ai(2) ai(3)]
```

.

returns
the filter order, `n`

= filtord(`d`

)`n`

, for the digital filter, `d`

.
Use the function `designfilt`

to
generate `d`

.

`designfilt`

| `digitalFilter`

| `isallpass`

| `ismaxphase`

| `isminphase`

| `isstable`

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