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#
# fields is a package for analysis of spatial data written for
# the R software environment.
# Copyright (C) 2024 Colorado School of Mines
# 1500 Illinois St., Golden, CO 80401
# Contact: Douglas Nychka, douglasnychka@gmail.com,
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with the R software environment if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
# or see http://www.r-project.org/Licenses/GPL-2
##END HEADER
"parse.grid.list" <- function(grid.list, order.variables = "xy") {
#
# utility to find the x and y sequences in grid.list
# this is used in predictSurface and as.surface
#
M <- length(grid.list)
gcounts <- unlist(lapply(grid.list, FUN = length))
xy <- (1:M)[(gcounts > 1)]
if( length(xy) ==1){
xy<- sort( c(xy, which(gcounts == 1 ) ) )
}
if (length(xy) > 2) {
stop("only two components of the grid list\ncan have more than one element")
}
#
# swap the roles of x and y for 2D grid
if (order.variables == "yx" & (M!=1) ) {
xy <- xy[2:1]
}
#
#
# here is the good stuff
#
nx <- gcounts[xy[1]]
ny <- gcounts[xy[2]]
x <- grid.list[[xy[1]]]
y <- grid.list[[xy[2]]]
#
# extract the names of the x and y components of the
# list
#
xlab <- names(grid.list)[xy[1]]
ylab <- names(grid.list)[xy[2]]
xlab <- ifelse(is.null(xlab), "X", xlab)
ylab <- ifelse(is.null(ylab), "Y", ylab)
list(x = x, y = y, nx = nx, ny = ny, xlab = xlab, ylab = ylab,
xy = xy)
}
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