On 21/03/2020 3:03 p.m., Emanuele Cordano wrote:
Dear list,
I just released on my Github account the following R package:
https://github.com/ecor/stringplus
containing an override of '+' arithmetic operator in order to sum two
strings as follows:
```
library(stringplus)
subject <- "Susan"
verb <- "is eating"
object <- "an apple"
out <- subject+" "+verb+" "+object
dir <- "~/mydrir/"
files <- c("myfile.txt","readme.txt")
```
I would like to submit "stringplus" to CRAN but while ckecking I found out
the following warning:
* checking S3 generic/method consistency ... WARNING
Warning: declared S3 method '+.character' not found
Warning: declared S3 method '+.default' not found
See section ‘Generic functions and methods’ in the ‘Writing R
Extensions’ manual.
R version 3.6.3 (2020-02-29) -- "Holding the Windsock"
I wrote the method in S3. I checked the section ‘Generic functions and
methods’ in the ‘Writing R' (R-release) Extensions’ manual but I did not
find a clear (to me) example or explanation for arithmetic (or base)
operators.
Do you suggest how to solve this warning?
I suspect the problem is that you created a new `+` generic function.
There's already an internal one of those in the base package; you
shouldn't create a new one.
There are other errors in your Github code; presumably you have local
changes that need to be committed and pushed there.
Duncan Murdoch
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