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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
"fields.mkpoly" <- function(x, m = 2, tag="term") {
# m-1 is the degree of the polynomial
# this is hold over notation from splines
# where an mth order spline has a m-1 degree polynomial
# null space.
if (m < 0)
stop("'m' has to be zero or larger.")
if( m==0){
# warning("Note: There is no polynomial fixed component")
return( NULL)
}
if (!is.matrix(x))
x <- as.matrix(x)
d <- ncol(x)
n <- nrow(x)
nterms <- choose((m + d - 1), d)
temp <- .Fortran("dmaket",PACKAGE="fields", m = as.integer(m), n = as.integer(n),
dim = as.integer(d), des = as.double(x), lddes = as.integer(n),
npoly = as.integer(nterms), tmatrix = as.double(rep(0,
n * (nterms))), ldt = as.integer(n), wptr = as.integer(rep(0,
d * m)), info = as.integer(0), ptab = as.integer(rep(0,
nterms * d)), ldptab = as.integer(nterms))
temp2 <- matrix(temp$tmatrix, nrow = n)
# add some column names
xNames<- colnames(x)
powerTable<- matrix(temp$ptab, nrow = nterms, ncol = d)
if( m <2){
colnames( temp2)<- "Intercept"
}
if( !is.null( xNames) & m >= 2 ){
varNames<- c("Intercept",xNames)
if( m > 2){
termNames<- NULL
for ( k in (d+ 2): nterms){
termNames<- c( termNames,
paste(powerTable[k,],collapse = "", sep="")
)
}
termNames<- paste0( tag, termNames)
varNames<- c( varNames,termNames)
}
colnames( temp2)<- varNames
}
attr(temp2, "ptab") <- powerTable
temp2
}
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