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# seqperiod() - Signal Processing

```p = seqperiod(x) returns
the integer p that corresponds to the period of
the sequence in a vector x. The period p is
computed as the minimum length of a subsequence x(1:p) of x that
repeats itself continuously every p samples in x.
The length of x does not have to be a multiple
of p, so that an incomplete repetition is permitted
at the end of x. If the sequence x is
not periodic, then p = length(x).If x is a matrix, then seqperiod checks
for periodicity along each column of x.
The resulting output p is a row vector with the same number of columns
as x.If x is a multidimensional array,
then seqperiod checks for periodicity along the
first nonsingleton dimension of x. In this case:p is a multidimensional array of
integers with a leading singleton dimension.The lengths of the remaining dimensions of p correspond
to those of the dimensions of x after the first
nonsingleton one.[p,num] = seqperiod(x) also
returns the number num of repetitions of x(1:p) in x. num might
not be an integer.```

### Syntax

`p = seqperiod(x)[p,num] = seqperiod(x)`

### Example

```Multichannel Signal PeriodsOpen This Example
Generate a multichannel signal and determine the period of each column.
x = [4 0 1 6;
2 0 2 7;
4 0 1 5;
2 0 5 6];

p = seqperiod(x)

p =

2     1     4     3

The first column of x has period 2. The second column of x has period 1. The third column of x is not periodic, so p(3) is just the number of rows of x. The fourth column of x has period 3, although the second repetition of the periodic sequence is incomplete.```