R devel - Feb 2005 - package check - empty line at end of .R file

Dear R-devel members,

I'm in the process of building a package (akmisc) for my own use (Win XP, R
2.0.1 Patched - see details at end).

As I was adding functions (and hence more source .R files) to my package it
got to the point were "R CMD check" failed with the following error
(output
has been cut).

* checking S3 generic/method consistency ... WARNING
Error in .try_quietly({ : Error: Unable to load R code in package
'akmisc'
Execution halted
See section 'Generic functions and methods' of the 'Writing R
Extensions'
manual.

In an attempt to figure out what went wrong I ran "R CMD INSTALL
--build"
and had a look a the file "akmisc" that had been installed in the
"akmisc/R"
folder in my default library. The contents of the file ended in (the
function stuff was only for testing)

"plotSymbols" <- function (fn=1) {
  ## Originally by Henrik Bengtsson
  ## modified by Rolf Turner
  ## Posted on R-Help 3 Feb 05
  i <- 0:255
    ncol <- 16
    opar <- par(cex.axis = 0.7, mar = c(3, 3, 3, 3) + 0.1)
    plot(i%%ncol, 1 + i%/%ncol, pch=i, font=fn, xlab = "", ylab =
"",
        axes = FALSE)
    axis(1, at = 0:15)
    axis(2, at = 1:16, labels = 0:15 * 16, las = 2)
    axis(3, at = 0:15)
    axis(4, at = 1:16, labels = 0:15 * 16 + 15, las = 2)
    par(opar)
}"stuff" <-
  function(p){
    return(0)
  }

As it turns out, the source file plotSymbols.R did not end in an empty line,
which caused an error only when there was another file after it (such as
stuff.R - the last file I had just added). I consequently went back to
"Writing R Extensions" (esp 1.1.4 Package subdirectories), but could
not
find any comment suggesting that files had to end with an empty line (or
more).

If I missed such a comment then I don't expect a response. But if I
haven't
then it may be useful if a comment is included in the documentation to maybe
help others.

Regards,

Andreas




OS: Windows XP
Precompiled R binary (from CRAN)
> version
         _              
platform i386-pc-mingw32
arch     i386           
os       mingw32        
system   i386, mingw32  
status   Patched        
major    2              
minor    0.1            
year     2004           
month    11             
day      21             
language R              
>
_____________________________
Dr Andreas Kiermeier
Statistician
SARDI FOOD SAFETY PROGRAM

33 Flemington Street
Glenside   SA   5065
Phone:  +61 8 8207 7884
Fax:       +61 8 8207 7854
Mobile: 0423 028 565

Email: Kiermeier.Andreas@saugov.sa.gov.au
_____________________________

The information in this e-mail and attachments (if any) may be confidential
and/or legally privileged. If you are not the intended recipient, any
disclosure, copying, distribution or action taken is prohibited. SARDI, The
South Australian Research and Development Institute, is the research
division of Primary Industries and Resources (SA)

R files do not have to end in an empty line, but lines do have to end in a 
line terminator (but two are not needed).  That is your problem: the last 
line of your file is unterminated.

R-devel (2.1.0-to-be) has the comment

     # use fast version of file.append that ensure LF between files

so this already has a workaround in that version.

Remember that in R commands are separated by newline or ;  so you need 
complete lines in files.  You may be able to adjust your editor to ensure 
this.


On Wed, 23 Feb 2005, Kiermeier, Andreas (PIRSA - SARDI) wrote:
> Dear R-devel members,
>
> I'm in the process of building a package (akmisc) for my own use (Win
XP, R
> 2.0.1 Patched - see details at end).
>
> As I was adding functions (and hence more source .R files) to my package it
> got to the point were "R CMD check" failed with the following
error (output
> has been cut).
>
> * checking S3 generic/method consistency ... WARNING
> Error in .try_quietly({ : Error: Unable to load R code in package
'akmisc'
> Execution halted
> See section 'Generic functions and methods' of the 'Writing R
Extensions'
> manual.
>
> In an attempt to figure out what went wrong I ran "R CMD INSTALL
--build"
> and had a look a the file "akmisc" that had been installed in the
"akmisc/R"
> folder in my default library. The contents of the file ended in (the
> function stuff was only for testing)
>
> "plotSymbols" <- function (fn=1) {
>  ## Originally by Henrik Bengtsson
>  ## modified by Rolf Turner
>  ## Posted on R-Help 3 Feb 05
>  i <- 0:255
>    ncol <- 16
>    opar <- par(cex.axis = 0.7, mar = c(3, 3, 3, 3) + 0.1)
>    plot(i%%ncol, 1 + i%/%ncol, pch=i, font=fn, xlab = "", ylab =
"",
>        axes = FALSE)
>    axis(1, at = 0:15)
>    axis(2, at = 1:16, labels = 0:15 * 16, las = 2)
>    axis(3, at = 0:15)
>    axis(4, at = 1:16, labels = 0:15 * 16 + 15, las = 2)
>    par(opar)
> }"stuff" <-
>  function(p){
>    return(0)
>  }
>
> As it turns out, the source file plotSymbols.R did not end in an empty
line,
> which caused an error only when there was another file after it (such as
> stuff.R - the last file I had just added). I consequently went back to
> "Writing R Extensions" (esp 1.1.4 Package subdirectories), but
could not
> find any comment suggesting that files had to end with an empty line (or
> more).
>
> If I missed such a comment then I don't expect a response. But if I
haven't
> then it may be useful if a comment is included in the documentation to
maybe
> help others.
>
> Regards,
>
> Andreas
>
>
>
>
> OS: Windows XP
> Precompiled R binary (from CRAN)
>
>> version
>         _
> platform i386-pc-mingw32
> arch     i386
> os       mingw32
> system   i386, mingw32
> status   Patched
> major    2
> minor    0.1
> year     2004
> month    11
> day      21
> language R
>>
>
> _____________________________
> Dr Andreas Kiermeier
> Statistician
> SARDI FOOD SAFETY PROGRAM
>
> 33 Flemington Street
> Glenside   SA   5065
> Phone:  +61 8 8207 7884
> Fax:       +61 8 8207 7854
> Mobile: 0423 028 565
>
> Email: Kiermeier.Andreas@saugov.sa.gov.au
> _____________________________
>
> The information in this e-mail and attachments (if any) may be confidential
> and/or legally privileged. If you are not the intended recipient, any
> disclosure, copying, distribution or action taken is prohibited. SARDI, The
> South Australian Research and Development Institute, is the research
> division of Primary Industries and Resources (SA)
>
> ______________________________________________
> R-devel@stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
>
-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595