RasterLayer from TransitionLayer object
Create a RasterLayer from a TransitionLayer with a call to
the generic function raster. The n x n transition matrix of
the TransitionLayer is transformed to form the values n cells of a raster.
## S4 method for signature 'TransitionLayer' raster(x, reduceMethod = "NZcolMeans")
x |
a Transition* object |
reduceMethod |
character for the method to reduce the transition matrix. See details |
The following methods to ‘reduce’ the transition matrix are
available with the optional argument reduceMethod):
colSums
rowSums
colMeans
rowMeans
NZcolMeans
NZrowMeans
The latter two methods only take into account the non-zero entries in the transition matrix. The default is NZcolMeans.
a RasterLayer
Jacob van Etten
#create a new raster and set all its values to unity. r <- raster(nrows=18, ncols=36) r <- setValues(r,runif(ncell(r),0,1)) #create a Transition object from the raster tr1 <- transition(r,mean,8) #asymmetric asf <- function(x) max(x) - x[1] + x[2] tr2 <- transition(r,asf,8, symm=FALSE) #create RasterLayer objects r1 <- raster(tr1) r2 <- raster(tr2) r3 <- raster(tr1, "colMeans")
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