#' guessResolution
#'
#' Guess the resolution of the given magpie object/coordinates by looking at the minimum
#' difference between unique sorted values. Fall back to 0.5 if guess is infinite.
#'
#' @param x A magpie object or the coordinates of a magpie object (the result
#' of \code{\link{getCoords}})
#' @return The guessed resolution of the data
#' @author Jan Philipp Dietrich, Pascal Sauer
#' @export
guessResolution <- function(x) {
if (is.magpie(x)) {
xy <- getCoords(x)
} else {
xy <- x
}
.tmp <- function(x) {
return(min(diff(sort(unique(x)))))
}
guess <- min(.tmp(xy[[1]]), .tmp(xy[[2]]))
# use 0.5deg as guess if it cannot be determined otherwise as this is
# the default spatial resolution in the magpie universe.
if (is.infinite(guess)) guess <- 0.5
return(guess)
}
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