Nothing
"mcp.rast" <- function(poly, w, border=c("include", "exclude"))
{
## Verifications
if (inherits(w, "asc"))
w <- as.kasc(list(to=w))
if (!inherits(w, "kasc")) stop("non convenient data")
if (ncol(poly)!=2)
stop("poly should have two columns")
## The first and last relocations should be the same (closed polygon)
if (!all(poly[1,]==poly[nrow(poly),]))
poly<-rbind(poly, poly[1,])
border <- match.arg(border)
## Slightly move the borders of the polygon
slightlymove <- function(mcp, w, bor)
{
if (bor=="include") {
oo <- 1
} else {
oo <- -1
}
amo <- oo*runif(1)*attr(w, "cellsize")/100
me <- apply(mcp,2,mean)
mcp[mcp[,1]<=me[1],1] <- mcp[mcp[,1]<=me[1],1] - amo
mcp[mcp[,1]>me[1],1] <- mcp[mcp[,1]>me[1],1] + amo
mcp[mcp[,1]<=me[2],2] <- mcp[mcp[,1]<=me[2],2] - amo
mcp[mcp[,1]>me[2],2] <- mcp[mcp[,1]>me[2],2] + amo
return(mcp)
}
poly <- slightlymove(poly, w, border)
## prepares the data
xy<-getXYcoords(w)
huhu<-getkasc(w, names(w)[1])
huhu[is.na(huhu)]<--9999
## Use of the C function "rastpolaire" itself calling the C
## function "rastpol" of the file "tests.c" of adehabitat
toto<-.C("rastpolaire", as.double(poly[,1]), as.double(poly[,2]),
as.double(xy$x), as.double(xy$y), as.double(t(huhu)),
as.integer(nrow(huhu)), as.integer(ncol(huhu)),
as.integer(nrow(poly)), PACKAGE="adehabitat")
## The output
output<-matrix(toto[[5]], nrow = nrow(huhu), byrow = TRUE)
output[output==0]<-NA
attr(output, "xll")<-attr(w, "xll")
attr(output, "yll")<-attr(w, "yll")
attr(output, "cellsize")<-attr(w, "cellsize")
attr(output, "type")<-"numeric"
class(output)<-"asc"
return(output)
}
## Another name for this function
"area2asc" <- mcp.rast
Any scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.