From murdoch.duncan at gmail.com  Sun Apr 10 15:20:21 2011
From: murdoch.duncan at gmail.com (Duncan Murdoch)
Date: Sun, 10 Apr 2011 09:20:21 -0400
Subject: [Rd] deparse operators in expressions
In-Reply-To: <BANLkTimQLeAeinPnK8JK6nrxANT_knUn0Q@mail.gmail.com>
References: <BANLkTimQLeAeinPnK8JK6nrxANT_knUn0Q@mail.gmail.com>
Message-ID: <4DA1AE95.8040300@gmail.com>

On 11-04-09 9:43 PM, Yihui Xie wrote:
> Hi,
>
> I observed a slight problem in deparse(): it will add spaces around
> most operators except /. I wonder if this is easy to fix. I know this
> is quite trivial, but I will appreciate if / is not treated as an
> exception. Examples:

It's easy to change:  take a look at src/main/deparse.c.  The operators 
that are labelled as PP_BINARY2 get no spaces.  Looking in 
src/main/names.c, we see those are /, ^, %%, %/% and :.

But clearly this is by design, and I think it's unlikely to change.

Duncan Murdoch


>> deparse(expression(1/1))
> [1] "expression(1/1)"
>> deparse(expression(1+1))
> [1] "expression(1 + 1)"
>> deparse(expression(1%in%1))
> [1] "expression(1 %in% 1)"
>
>> sessionInfo()
> R version 2.12.2 (2011-02-25)
> Platform: x86_64-pc-linux-gnu (64-bit)
>
> locale:
>   [1] LC_CTYPE=en_US.utf8       LC_NUMERIC=C
>   [3] LC_TIME=en_US.utf8        LC_COLLATE=en_US.utf8
>   [5] LC_MONETARY=C             LC_MESSAGES=en_US.utf8
>   [7] LC_PAPER=en_US.utf8       LC_NAME=C
>   [9] LC_ADDRESS=C              LC_TELEPHONE=C
> [11] LC_MEASUREMENT=en_US.utf8 LC_IDENTIFICATION=C
>
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base
>
>
>
> Regards,
> Yihui
> --
> Yihui Xie<xieyihui at gmail.com>
> Phone: 515-294-2465 Web: http://yihui.name
> Department of Statistics, Iowa State University
> 2215 Snedecor Hall, Ames, IA
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel



[Rd] deparse operators in expressions
Duncan Murdoch