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# LatticeKrig is a package for analysis of spatial data written for
# the R software environment .
# Copyright (C) 2016
# University Corporation for Atmospheric Research (UCAR)
# Contact: Douglas Nychka, nychka@ucar.edu,
# National Center for Atmospheric Research, PO Box 3000, Boulder, CO 80307-3000
#
# 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
LKrig.precision <- function(LKinfo, return.B = FALSE,
verbose=FALSE) {
L <- LKinfo$nlevel
offset <- LKinfo$latticeInfo$offset
# some checks on arguments
LKinfoCheck(LKinfo)
# ind holds non-zero indices and ra holds the values
ind <- NULL
ra <- NULL
da <- rep(0, 2)
# loop over levels
for (j in 1:L) {
# evaluate the SAR matrix at level j.
tempB<- LKrigSAR( LKinfo, Level=j)
if( verbose){
cat("dim indices in spind of B:",dim( tempB$ind) , fill=TRUE)
}
# accumulate the new block
# for the indices that are not zero
ra <- c(ra,tempB$ra )
ind <- rbind(ind, tempB$ind + offset[j])
# increment the dimensions
da[1] <- da[1] + tempB$da[1]
da[2] <- da[2] + tempB$da[2]
}
# dimensions of the full matrix
# should be da after loop
# check this against indices in LKinfo
#
if ((da[1] != offset[L + 1]) | (da[2] != offset[L +
1])) {
stop("Mismatch of dimension with size in LKinfo")
}
# convert to spind format:
# tempBtest <- list(ind = ind, ra = ra, da = da)
# tempB<- spind2spam( tempBtest)
if( verbose){
cat("dim of ind (fullB):", dim( ind), fill=TRUE)
}
tempB <- spam( list( ind=ind, ra), nrow=da[1], ncol=da[2])
if( verbose){
cat("dim after spind to spam in precision:", dim( tempB), fill=TRUE)
}
if (return.B) {
return(tempB)
}
else {
# find precision matrix Q = t(B)%*%B and return
return(t(tempB) %*% (tempB))
}
}
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