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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.edu,
%#
%# 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
%##END HEADER
\name{fields exported FORTRAN}
\alias{css}
\alias{ddfind}
\alias{dmaket}
\alias{evlpoly}
\alias{evlpoly2}
\alias{igpoly}
\alias{inpoly}
\alias{multeb}
\alias{multrb}
\alias{radbas}
\alias{rcss}
\title{
FORTRAN subroutines used in fields functions
}
\description{
These functions implement cubic smoothing splines and also provide some basic
computations for radial basis functions. All are called using the \code{.FORTRAN}
interface.
}
\details{
For these low level FORTRAN subroutines refer to the R functions for the calling
sequence and to the src subdirectory of the fields package for the source code.
\describe{
\item{css}{Computes a cubic smoothing spline see \code{sreg} and \code{splint}}
\item{ddfind}{Finds nearest neighbor points within a fixed distance. See \code{fields.rdist.near}}
\item{dmaket}{Creates matrix of all polynomial terms up to fixed order. See \code{fields.mkpoly}}
\item{evlpoly}{Evaluates a univariate polynomial. See \code{fields.evlpoly}}
\item{evlpoly2}{Evaluates a multivariate polynomial. See \code{fields.evlpoly2}}
\item{inpoly}{Determine which 2-d locations are within a polynomial. see \code{in.poly}}
\item{igpoly}{Determine which 2-d grid points locations are within a polynomial. see \code{in.poly.grid}}
\item{multeb}{Multiply an exponential cross covariance matrix by another matrix. See \code{exp.cov}}
\item{multrb}{Multiply an radial basis function matrix by another matrix. See \code{rad.cov}}
\item{radbas}{Evaluates radial basis functions. See \code{rdist.R}}
\item{rcss}{Robust cubic smoothing spline. See \code{qsreg}}
}
}
\keyword{internal}
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