R version 3.4.0 (2017-04-21) -- "You Stupid Darkness"
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Platform: x86_64-apple-darwin15.6.0 (64-bit)

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>  # fields is a package for analysis of spatial data written for
>   # the R software environment .
>   # Copyright (C) 2017
>   # 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.
> 
> 
> library( fields)
Loading required package: spam
Loading required package: grid
Spam version 1.4-0 (2016-08-29) is loaded.
Type 'help( Spam)' or 'demo( spam)' for a short introduction 
and overview of this package.
Help for individual functions is also obtained by adding the
suffix '.spam' to the function name, e.g. 'help( chol.spam)'.

Attaching package: 'spam'

The following objects are masked from 'package:base':

    backsolve, forwardsolve

Loading required package: maps
> # tests of predict.se
> # using approximations for conditional simulation on a grid. 
> #
> options( echo=FALSE)
all done with grid based se tests
> 
> proc.time()
   user  system elapsed 
  0.764   0.043   0.800