relative.position {RSAGA} | R Documentation |
relative.position
and relative.rank
are used
with focal.function
to determine the relative value of
a grid cell compared to its surroundings, either on a metric scale or
based on ranks.
relative.position(x) relative.rank(x, ties.method="average")
x |
a square matrix with the grid data from the moving window,
possibly containing NA values |
ties.method |
see rank |
If x
is provided, a numeric value in the interval [0,1] is returned.
If x
is missing, a character vector of same length giving suggested
variable (or file) names, here "relpos"
and "relrank"
,
respectively. See focal.function
for details.
Alexander Brenning
focal.function
, rank
,
centervalue
m = matrix( round(runif(9,1,10)), ncol=3 ) print(m) relative.position(m) relative.rank(m) ## Not run: focal.function("dem",fun=relative.rank,radius=5) focal.function("dem",fun=relative.position,radius=5) relrank = as.vector(read.ascii.grid("relrank")$data) relpos = as.vector(read.ascii.grid("relpos")$data) plot(relpos,relrank,pch=".") cor(relpos,relrank,use="complete.obs",method="pearson") ## End(Not run)