Nothing

```
# fields is a package for analysis of spatial data written for
# the R software environment .
# Copyright (C) 2018
# 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
compactToMat = function(compactMat, diagVal=0, lower.tri=FALSE, upper.tri=TRUE) {
#compactMat: a symmetric matrix stored as a vector containing elements for the upper triangle
#portion of the true matrix
#diagVal: a number to put in the diagonal entries of the output matrix
#lower.tri: if TRUE, fills in lower tringular portion of the matrix
#upper.tri: if TRUE, fills in upper tringular portion of the matrix
if(class(compactMat) == 'dist') {
n <- attr(compactMat, "Size")
} else { # (n^2 - n)/2 = length(compactMat)
stop("input matrix is not compact or is not of class \"dist\"")
#or if class is not dist but input matrix is still compact, use:
#n = (1 + sqrt(1 + 8*length(compactMat)))/2
}
return(.Call("compactToMatC", as.double(compactMat),
as.integer(length(compactMat)),
as.integer(n), as.double(diagVal),
as.integer(lower.tri), as.integer(upper.tri),
PACKAGE="fields"))
}
```

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