ArithMath-methods: Arithmetic and mathematical operations with objects of...

In gdistance: Distances and Routes on Geographical Grids

Arithmetic and mathematical operations with objects of Transition* classes

Description

Standard arithmetic operators for computations with Transition* objects and numeric values. Transition objects must have the same extent and resolution. All arithmetic and mathematical operations that work on the sparse matrices are available for Transition* objects.

Usage

## S4 method for signature 'TransitionLayer,TransitionLayer'
Arith(e1, e2)

Arguments

e1	objects
e2	objects

Value

a Transition* object or numeric.

Author(s)

Jacob van Etten

Examples

#create a new raster and set all its values to unity.
raster <- raster(nrows=18, ncols=36)
raster <- setValues(raster,rep(1,ncell(raster)))

#create TransitionLayer objects
tr1 <- transition(raster,mean,4)
tr2 <- tr1

#arithmetic operations
tr3 <- tr1 * tr2
tr4 <- tr3 * 4

#mathematical operations
tr5 <- sqrt(tr4)

gdistance documentation built on July 9, 2023, 5:51 p.m.