exceeds_tumbling_sum: Check When the Tumbling Sum of a Vector Exceeds a Threshold

In lest: Vectorised Nested if-else Statements Similar to CASE WHEN in 'SQL'

Description

The tumbling sum is calculated as the partial cumulative sum of a vector until a threshold is exceeded. Once this happens, the tumbling sum is calculated from zero again. exceeds_tumbling_sum() returns TRUE whenever this threshold is hit/exceeded and FALSE otherwise.

Usage

exceeds_tumbling_sum(x, threshold, inclusive = TRUE)

Arguments

x	a numeric vector
threshold	a numeric scalar
inclusive	a logical scalar. If TRUE inclusive bounds are used (i.e. the threshold is checked with >=), otherwise exclusive

Details

This is for example useful if you have high frequency GPS positions and want to keep only points that are at least x seconds apart.

Value

a logical vector of the same length as x that is TRUE whenever threshold was exceeded and FALSE otherwise

See Also

MESS::cumsumbinning() does something very similar, but returns group indices instead of a logical vector.

Examples

exceeds_tumbling_sum(c(1, 3, 3, 3), 4)

lest documentation built on Jan. 11, 2020, 9:37 a.m.