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findsequences

Find sequences of repeated (adjacent/consecutive) numeric values.

Syntax

function varargout = findsequences(A)

Description

SEQUENCES = FINDSEQUENCES(A) finds sequences of repeated numeric values in A along the first dimension. A should be numeric. SEQUENCES is a "m by 4" numeric matrix where m is the number of sequences found.

Each sequence has 4 columns where: - 1st col. - The value being repeated - 2nd col. - The position of the first value of the sequence (startIndices) - 3rd col. - The position of the last value of the sequence (endIndices) - 4th col. - The length of the sequence (seqLengths)

[VALUES, INPOS, FIPOS, LEN] = FINDSEQUENCES(...) returns SEQUENCES as separate outputs. If no sequences are found no value is returned. To convert positions into subs/coordinates use IND2SUB.

Source Code

View source code

Examples

% Find sequences of repeated values in a matrix
A = [20, 19,   3,   2, NaN, NaN;
    20, 23,   1,   1,   1, NaN;
    20,  7,   7, NaN,   1, NaN];

OUT = findsequences(A);
% OUT contains:
%   Value  startIndices  endIndices  seqLengths
%    20        1              3           3       % Three 20s in first column
%     1       14             15           2       % Two 1s (positions 14-15)
%   NaN       16             18           3       % Three NaNs (positions 16-18)

% Get separate outputs
[values, startPos, endPos, lengths] = findsequences(A);

See Also

Module: TOOLS | Last Updated: 2025-09-04