[Bioc-devel] Imports, depends and warnings

Federico Marini marinif at uni-mainz.de
Wed Mar 2 16:53:54 CET 2016

Hi Bioconductors,

I'm on a good way to finalize the pcaExplorer package I presented at the 
recent Bioc Developers Meeting.

Trying to keep check and BiocCheck always in the background of my head, 
as well as trying to be a good 'package neighbour', I am dealing with 
the issue of some "Warning: replacing previous import by..." messages, 
when building/loading/checking.

 From my understanding, there might be some cases where this can not be 
fixed, probably because an imported package in turn imports itself 
another one entirely, making my own import redundant (e.g., ggplot2 for 
plotting and NMF for aheatmap give this part:

Warnung: replacing previous import by ‘ggplot2::unit’ when loading ‘NMF’
Warnung: replacing previous import by ‘ggplot2::arrow’ when loading ‘NMF’

This happens even if I specifically just use importFrom in the NAMESPACE.

I'm kind of puzzled on this, so I thought I'd better ask out for some 
expert advice on the ML. If required, I could put the package in a 
GitHub repository.

Thank you in advance for any help you can provide!


Federico Marini, M.Sc.
Institute of Medical Biostatistics, Epidemiology and Informatics (IMBEI)
Division Biostatistics and Bioinformatics
University Medical Center of the Johannes Gutenberg University Mainz
Postal address: 55101 Mainz
Office and delivery address: Obere Zahlbacher Str. 69, 55131 Mainz

Phone: +49 (0) 6131 17-8108
Fax: +49 (0) 6131 17-2968
Web: www.imbei.uni-mainz.de
E-Mail: marinif at uni-mainz.de

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