R/make.surface.grid.R

In fields: Tools for Spatial Data

#
# 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
"make.surface.grid" <- function(grid.list) {
    #
    # the old fields version of make.surface.grid was complicated
    # and we believe rarely used.
    # this current function
    # is essentially a single line replacement
    #
    # but adds an attribute for the grid matrix to carry
    # and carries along the names of the grid.list variables.
    # along the information as to how it was created.
    # see as.surface
    # NOTE: for compatibility this works for a 1D grid
    #
    temp <- as.matrix(expand.grid(grid.list))
    # wipe out row names
    dimnames(temp) <- list(NULL, names(grid.list))
    # set attribute
    attr(temp, "grid.list") <- grid.list
    return(temp)
}