identifyBlocksVariable: Identifies data value groups within a 'data.frame' column.

In henningte/herdersTA: Extracting Movement Characteristics from GPS Trajectories of Nomadic Households

Description

identifyBlocksVariable identifies blocks of rows in the data slot of a Track object or data.frame object based on a grouping variable and a value for this variable. A block is defined as a set of directly subsequent rows with the same value for the specified variable.

Usage

identifyBlocksVariable(currenttrack, variable, value)

Arguments

currenttrack	A Track object (or data.frame object) with a boolean column gap in currenttrack@data. Data values have to be regularly spaced (may be achieved for example with reorganizeTracks).
variable	A character value indicating the name of a variable in currenttrack@data to group for.
value	A value of the currenttrack@data$variable for which to identify blocks of subsequent rows.

Value

A matrix with two columns and rows for each identified block. The first column indicates the row of currenttrack@data where the block begins and the second column indicates the row of currenttrack@data where the block ends or NULL if value does not exist for variable.

Examples

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henningte/herdersTA documentation built on Jan. 22, 2020, 5:16 a.m.