R help - Jun 2000 - postscript problem in 1.1.0

Hi.

I just compiled R 1.1.0 on a Xeon machine running Linux.  When I try to
open a postscript file, I get the error 

Error in old$command == "default" : comparison (1) is possible only
for
vector types

The offending line seems to be 

    if (old$command == "default") 
        old$command <- if (!is.null(cmd <-
getOption("printcmd")))
            cmd
    else "" 

which has been added since 1.0.1. 

The problem seems to be that old has no component named command. 
ps.options doesn't return any such component, nor will it allow any such
component to be set, even with override.check = T.  And removing the lines
doesn't work, because the internal PS function called at the end of the
function looks for old$command, too. 

I was able to use postscript in 1.0.1.  I looked through the NEWS, but
couldn't find anything that seems to address this problem. 

Any help appreciated.

Matt Wiener



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On Wed, 21 Jun 2000, Matthew Wiener wrote:
> Hi.
> 
> I just compiled R 1.1.0 on a Xeon machine running Linux.  When I try to
> open a postscript file, I get the error 
> 
> Error in old$command == "default" : comparison (1) is possible
only for
> vector types
> 
> The offending line seems to be 
> 
>     if (old$command == "default") 
>         old$command <- if (!is.null(cmd <-
getOption("printcmd")))
>             cmd
>     else "" 
> 
> which has been added since 1.0.1. 
> 
> The problem seems to be that old has no component named command. 
> ps.options doesn't return any such component, nor will it allow any
such
> component to be set, even with override.check = T.  And removing the lines
> doesn't work, because the internal PS function called at the end of the
> function looks for old$command, too. 
> 
> I was able to use postscript in 1.0.1.  I looked through the NEWS, but
> couldn't find anything that seems to address this problem. 
[Well, there is a lot about postscript() changes there.]

Try looking in the NEWS of R-patched (formerly R-release).  The problem is
that you have a saved .Postscript.options object from an earlier release of
R. None of us testing it did, so I guess it must be rare to set
ps.options() and then save the workspace.


I have already posted a fix here, which is to use

.Postscript.options$command <- "default"

to update your saved object. The R-patched version of postscript() has

    if(is.null(old$command) || old$command == "default")
        old$command <- if(!is.null(cmd <-
getOption("printcmd"))) cmd else ""

R-patched is supposed to have all the current patches applied, but as we
have had problems with it recently, don't take my word for it.

-- 
Brian D. Ripley,                  ripley at 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 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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