Running 'demo_article-jss-example1.R'
  Comparing 'demo_article-jss-example1.Rout' to 'demo_article-jss-example1.Rout.save' ... OK
  Running 'demo_article-jss-example2.R'
Running the tests in 'tests/demo_article-jss-example2.R' failed.
Complete output:
  > # HEADER ####################################################
  > # This is file spam/tests/demo_article-jss-example2.R.      #
  > # It is part of the R package spam,                         #
  > #  --> https://CRAN.R-project.org/package=spam              #
  > #  --> https://CRAN.R-project.org/package=spam64            #
  > #  --> https://git.math.uzh.ch/reinhard.furrer/spam         #
  > # by Reinhard Furrer [aut, cre], Florian Gerber [aut],      #
  > #    Roman Flury [aut], Daniel Gerber [ctb],                #
  > #    Kaspar Moesinger [ctb]                                 #
  > # HEADER END ################################################
  >      
  > 
  > 
  > # INITALIZE AND FUNCTIONS:
  > # JSS article:
  > #     "spam: A Sparse Matrix R Package with Emphasis on
  > #            MCMC Methods for Gaussian Markov Random Fields"
  > 
  > 
  > # Compared to the R code in the article, here we give:
  > # - improved formatting
  > # - more comments, e.g. how to run the code using regular matrices 
  > # - the code to construct the figures
  > # - minor modifcations due to evolvement of spam
  >  
  > 
  > cat("\nThis demo contains the R code of the second example\nin the JSS article. As pointed out by Steve Geinitz\nand Andrea Riebler, the Gibbs sampler is not correct\nand contains several bugs. \n\nI'll post an updated sampler in a future release.\n\n") 
  
  This demo contains the R code of the second example
  in the JSS article. As pointed out by Steve Geinitz
  and Andrea Riebler, the Gibbs sampler is not correct
  and contains several bugs. 
  
  I'll post an updated sampler in a future release.
  
  > 
  > 
  > # INITALIZE AND FUNCTIONS:
  > require("fields", warn.conflict=FALSE)
  Loading required package: fields
  Warning message:
  In library(package, lib.loc = lib.loc, character.only = TRUE, logical.return = TRUE,  :
    there is no package called 'fields'
  > options(spam.structurebased=TRUE)
  > 
  > 
  > # READ DATA:
  > attach(Oral)
  Error in attach(Oral) : object 'Oral' not found
  Execution halted