Nothing
#
# covariates.R
#
# evaluate covariates
#
# $Revision: 1.4 $ $Date: 2022/01/04 05:30:06 $
#
evalCovariate <- function(covariate, locations) {
# evaluate covariate of any kind at specified locations
covvalues <-
if(is.im(covariate))
safelookup(covariate, locations)
else if(is.function(covariate))
covariate(locations$x, locations$y)
else if(is.numeric(covariate) || is.factor(covariate)) {
if(length(covariate) == 1L)
rep.int(covariate, length(locations$x))
else if(length(covariate) == length(locations$x))
covariate
else stop("Inappropriate length for covariate vector")
} else
stop("Covariate should be an image, a function or a factor/numeric vector")
return(covvalues)
}
ppmCovariates <- function(model) {
# generate list of all covariates in ppm (excluding marks)
stopifnot(is.ppm(model))
co <- as.list(model$covariates)
xy <- list(x=function(x,y){x}, y=function(x,y){y})
coplus <- append(co, xy)
return(as.anylist(coplus))
}
findCovariate <- function(covname, scope, scopename=NULL) {
# find the named covariate in the given ppm object or list
if(is.ppm(scope)) {
covlist <- ppmCovariates(scope)
if(missing(scopename)) scopename <- "covariates in model"
} else if(is.list(scope)) {
covlist <- scope
} else stop("scope should be a named list of covariates, or a ppm object")
if(!(covname %in% names(covlist)))
stop(paste("covariate", dQuote(covname), "not found",
if(!is.null(scopename)) paste("amongst", scopename) else NULL))
covlist[[covname]]
}
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