tripEstimation (version 0.0-46)

bits: Set and get bits from binary masks.

Description

Utility functions to access bits from numeric values, for the efficient storage of spatial masks.

Usage

bits(object, bit)
bits(object, bit) <-  value

Value

A numeric object with the given bit set, or a logical value designating the status of the given bit.

Arguments

object

a numeric value

bit

the desired bit

value

logical value to set bit to

Author

Michael D. Sumner

Details

R uses 32-bit integers, so we can (easily) access 31 binary matrices in each numeric matrix. This is very useful for storing long time-series of spatial masks, required for track-location estimation from archival tags.

See Also

See Also get.mask for a higher level access of a mask object

Examples

a <- 1L
bits(a, 0)  ## 1
bits(a, 2) <- 1
a   # 5