p = seqperiod(x) returns
the integers that correspond to the periods of the sequences in 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.

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.

Compute the number of times that each periodic sequence is repeated.

[~,nr] = seqperiod(x)

nr = 1×4
2.0000 4.0000 1.0000 1.3333

In the first column of x, the periodic sequence appears twice. In the second column, the one-sample sequence is repeated as many times as there are samples. In the third column, there is no repetition. The number of repetitions in the fourth column is one plus the fraction of the sequence length represented by the remaining sample.

Generate a two-channel sinusoid such that one channel has four periods in the sampling interval and the other channel has two periods. Plot the sinusoid.

n = 0:31;
x = cos(2*pi./[8;16].*n)';
plot(n,x,'.-')
axis tight

Compute the lengths of the repeated subsequences and the number of repetitions. Specify an absolute tolerance of 1e-5.

Compute the period of the repeating sequence and the number of repetitions contained in the array. The function works along the third dimension, as expected.

p — Sequence period scalar | vector | matrix | N-D array

Sequence period, returned as a scalar, vector, matrix, or N-D
array. If a sequence is not periodic, then p equals the length of
x along the chosen dimension.

If x is a matrix, then p is a row
vector with the same number of columns as x.

If x is a multidimensional array, then
p is a multidimensional array of integers whose first
dimension is of size 1. The remaining dimensions of p
correspond to the remaining dimensions of x with sizes larger
than 1.

nr — Number of sequence repetitions vector | matrix | N-D array

Number of sequence repetitions, returned as a scalar, vector, matrix, or
N-D array. nr has the same dimensions as
p. The elements of nr are not necessarily
integers.

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