R help - Oct 2011 - avoid s3 methods

Hello everybody.

My issue arise when I build a package with my functions. This package is for
personal purposes only and it will not submitted to CRAN.

Anyway, this may be an opportunity for myself to clear the S3 methods
concept. I read the R manual and some books about R programming but they are
usually S4 oriented.

I call a function plot.days(). When I check the package I obtain some
inconsistencies because this function is a method of the plot() function and
it requires at least the same arguments.

Since an object call days doesn't exist, I am not interested to access my
function using plot() but I would like to name it plot.days().

Is there anyway to declare that my plot.days() function is not a method for
the plot() function?

I hope the question is clear, despite methods are a new world for me.

Thank you very much.

Regards,
Nicola

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On 18.10.2011 10:37, Nicola Sturaro Sommacal wrote:
> Hello everybody.
>
> My issue arise when I build a package with my functions. This package is
for
> personal purposes only and it will not submitted to CRAN.
>
> Anyway, this may be an opportunity for myself to clear the S3 methods
> concept. I read the R manual and some books about R programming but they
are
> usually S4 oriented.
>
> I call a function plot.days(). When I check the package I obtain some
> inconsistencies because this function is a method of the plot() function
and
> it requires at least the same arguments.
>
> Since an object call days doesn't exist, I am not interested to access
my
> function using plot() but I would like to name it plot.days().
>
> Is there anyway to declare that my plot.days() function is not a method for
> the plot() function?
>
> I hope the question is clear, despite methods are a new world for me.

The S3 method definition happens only by the name of the method: 
"NameOfTheGeneric.Class". Hence plot.days is by definition a method
for
the "plot" generic for objects of class "days". If you want
a function
that is not such a method, rename it. plot_days will do, for example.

Uwe Ligges


> Thank you very much.
>
> Regards,
> Nicola
>
> 	[[alternative HTML version deleted]]
>
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