Find contiguous sequences in a vector of integers

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Description

Get all sequences of contiguous values in a vector of integers.

Usage

1

Arguments

x

A vector of integers, for example, representing indices. x is coerced to integer, sorted, and unique values extracted, if necessary, before finding the contiguous sequences.

Value

A matrix with one row for each sequence, and two columns containing the start and the end of the sequence, respectively.

Author(s)

Chris Jackson <chris.jackson@mrc-bsu.cam.ac.uk>. Thanks to Tobias Verbeke for the suggestion.

See Also

sectioned.density

Examples

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seqToIntervals(1:10)  # [1 10]
seqToIntervals(c(1:10, 15:18, 20))  # [1 10; 15 18; 20 20]
# vectorised, so efficient for large vectors x
seqToIntervals(sample(1:1000000, size=999990))