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#' pointweights.R
#'
#' get a valid vector of weights for a point pattern
#'
#' Argument 'weights' is usually passed from a user-level function
#' It may be:
#' a numeric vector
#' a single number
#' a function(x,y)
#' a pixel image
#' an expression involving the coordinates and marks
#'
#' $Revision: 1.3 $ $Date: 2022/05/23 02:33:06 $
pointweights <- function(X, ..., weights=NULL, parent=NULL) {
if(is.null(weights)) return(NULL)
nX <- npoints(X)
if(is.numeric(weights) && is.vector(as.numeric(weights))) {
if(length(weights) == 1) weights <- rep(weights, nX)
} else if(is.im(weights)) {
weights <- safelookup(weights, X) # includes warning if NA
} else if(is.function(weights)) {
weights <- weights(X$x, X$y)
} else if(is.expression(weights)) {
#' evaluate expression in data frame of coordinates and marks
df <- as.data.frame(X)
weights <- try(eval(weights, envir=df, enclos=parent))
if(inherits(weights, "try-error"))
stop("Unable to evaluate expression for weights", call.=FALSE)
if(length(weights) == 0) return(NULL)
} else stop(paste("Argument 'weights' should be",
"a numeric vector, a function, an image,",
"or an expression"), call.=FALSE)
check.nvector(weights, nX, vname="weights")
return(weights)
}
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