[R] R CMD methods and ggplot2 advice

[Thierry Onkelinx]

Dear Rolf,

utils::globalVariables() seems to work package wide. I prefer to ignore
these variable only within the function in which I explicitly define them.
If I use one of those variables in another function in which I haven't
declared them as global, then I want R CMD check to give me a NOTE.

Best regards,

ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature and
Forest
team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
Kliniekstraat 25
1070 Anderlecht
Belgium

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to say
what the experiment died of. ~ Sir Ronald Aylmer Fisher
The plural of anecdote is not data. ~ Roger Brinner
The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of data.
~ John Tukey

2015-05-28 11:28 GMT+02:00 Rolf Turner <r.turner op auckland.ac.nz>:

> On 27/05/15 23:37, Thierry Onkelinx wrote:
>
>> Dear Glenn,
>>
>> Suppose this function
>>
>> test <- function(df){
>>    ggplot(df, aes(x = gp, y = y)) + geom_point()
>> }
>>
>> Then R CMD check will consider gp and y as global variables since they are
>> undefined. Because R CMD check cannot detect that gp and y will be
>> extracted from df by ggplot2.
>>
>> Possible workarounds
>>
>> # now gp and y are defined within the function. ggplot2 still looks for gp
>> and y in df.
>> test <- function(df){
>>    gp <- NULL
>>    y <- NULL
>>    ggplot(df, aes(x = gp, y = y)) + geom_point()
>> }
>>
>> # now "gp" and "y" are strings and hence defined
>> test <- function(df){
>>    ggplot(df, aes_string(x = "gp", y = "y")) + geom_point()
>> }
>>
>
> <SNIP>
>
> Why not use utils::globalVariables?
>
> cheers,
>
> Rolf Turner
>
> --
> Technical Editor ANZJS
> Department of Statistics
> University of Auckland
> Phone: +64-9-373-7599 ext. 88276
>

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