Nothing
mrgrid <-
function(mr, dlat = 5, dlon = 10, fill = FALSE, ...)
{
n <- length(mr)
lat <- mr2d(mr, dlat = dlat, dlon = dlon)$lat
lon <- mr2d(mr, dlat = dlat, dlon = dlon)$lon
lat <- c(rep(lat, 5), rep(NA, n))
lon <- c(rep(lon, 5), rep(NA, n))
lat <- as.vector(matrix(matrix(lat, nrow = 6, byrow = T), ncol = 1))
lon <- as.vector(matrix(matrix(lon, nrow = 6, byrow = T), ncol = 1))
lat <- lat + c(dlat/120, dlat/120, - dlat/120, - dlat/120, dlat/
120, NA)
lon <- lon + c(dlon/120, - dlon/120, - dlon/120, dlon/120, dlon/
120, NA)
lat <- data.frame(lat = lat, lon = lon)
if(fill)
geopolygon(lat, ...)
else geolines(lat, ...)
}
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