[Rd] (no) circular dependency

[Thierry Onkelinx]

Dear Dmitri,

If it's only a small number of functions then move them the relevant
functions for A to B so that B works without A. Then Import these functions
from B in A. Hence A depends on B but B is independent of A.

It is requires to move a lot of functions than you better create a package
C with all the common functions. Then A and B import those functions from C.

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

2016-04-06 8:42 GMT+02:00 Dmitri Popavenko <dmitri.popavenko at gmail.com>:

> Hello all,
>
> I would like to build two packages (say A and B), for two different
> purposes.
> Each of them need one or two functions from the other, which leads to the
> problem of circular dependency.
>
> Is there a way for package A to import a function from package B, and
> package B to import a function from package A, without arriving to circular
> dependency?
> Other suggestions in the archive mention building a third package that both
> A and B should depend on, but this seems less attractive.
>
> I read about importFrom() into the NAMESPACE file, but I don't know how to
> relate this with the information in the DESCRIPTION file (other than adding
> each package to the Depends: field).
>
> Thank you,
> Dmitri
>
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