On 04.10.2011 18:18, Duncan Murdoch wrote:
On 04/10/2011 7:04 AM, S Ellison wrote:
See para 10.3.2 'Identifiers' in the R language definition (always
distributed with R in the html help system), or ?make.names, for a
concise statement of what constitutes a valid variable name in R.
It's actually underscores that might give trouble with older versions,
not '.'. But they'd have to be a lot older by R standards (pre 1.9.0).
I am not sure why there has been a recent shift away from periods and
towards camelCase in some R packages;
Presumably the authors of those packages prefer camelCase. I don't think
it's any more complicated than that.
I switched to that when I realized that it is somewhat dangerous to
conflict with S3 naming conventions and R CMD check yelled correctly
because I used a generic.class notation where either "generic" or
"class" was really the name of a generic or class but I had not realized
before.
Uwe
Duncan Murdoch
personally I find a period or underscore much more useful for making a
variable name readable. And a mix of camelCase and period.breaks makes
it a lot harder to guess which case-sensitive string to use. The
number of different combinations of case and period I end up trying
for R.Version (occasionally used, never quite often enought to be
automatic) defies belief ;-).
S Ellison
> From: r-help-boun...@r-project.org On Behalf Of Smart Guy
> Sent: 04 October 2011 05:20
> To: r-help@r-project.org
> Subject: [R] The use of period in function names and variable names
>
> Hi,
> I am looking for some guidance on whether I can use the
> period(.) in function names and variable names.
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