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.

`Transition*`

object or numeric.

Jacob van Etten

1 2 3 4 5 6 7 8 9 10 11 12 13 14 | ```
#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)
``` |

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