This is the FAQ, currently under construction.
Most Bioconductor packages are available for Windows, Mac OS, and
Linux operating systems. A few packages are not available on one or
more platforms. This usually occurs because the package relies on
additional software that is not available for the operating
system. For instance, a user trying to install
encountered this message:
> biocLite("GeneRfold") Using R version 2.11.1, biocinstall version 2.6.8. Installing Bioconductor version 2.6 packages:  "GeneRfold" Please wait... Warning message: In getDependencies(pkgs, dependencies, available, lib) : package 'GeneRfold' is not available
Visiting the list of package home pages shows that the package was not available on Windows, the platform on which the user was trying to install the package. If the package Description does not indicate why the package is not available, please feel free to ask on the Bioconductor mailing list.
It's useful to check that the package name is spelt correctly, with correct capitalization!
A common reason for a package to fail to install is that
Bioconductor software dependencies are not satisfied, as shown here
from a user trying to install the
... ** inst ** preparing package for lazy loading Error: package 'affy' required by 'affyPLM' could not be found Execution halted ERROR: lazy loading failed for package 'affyPLM'
Less commonly, packages may install but then fail to load, as here
Error in dyn.load(file, DLLpath = DLLpath, ...) : unable to load shared library '/usr/local/lib64/R/library/Rsamtools/libs/Rsamtools.so': /usr/local/lib64/R/library/Rsamtools/libs/Rsamtools.so: undefined symbol: ecrc32
This is likely a system configuration issue, e.g., a Windows
environment variable is not set correctly, or the Linux
LD_LIBRARY_PATH environment variable is incorrect.
Packages may also fail to install because third party software is not
available. This often happens during the
configure part of the
package installation process, as illustrated here with the
* Installing *source* package 'XML' ... ... checking for xml2-config... no Cannot find xml2-config ERROR: configuration failed for package 'XML'
These types of errors can sometimes be easily solved (installing necessary libraries or other software, perhaps referenced on the package home page). It will often be necessary to understand your system more thoroughly than you'd like, perhaps with the assistance of the Bioconductor mailing list.
To install a package from the development version of the Bioconductor repository,
install and use the development version of R.
biocLite() will automatically
download packages from the correct repository. Similarly, if using older versions
biocLite() will install the appropriate version of packages.
There are three main steps to using a package. (1) Identify an appropriate package. Do this using [biocViews][/packages/release/BiocViews.html] to browse available software. (2) Explore overall package functionality and work flows. Do this by reading the package vignettes, listed on the page describing the package and available from biocViews. For instance, locate IRanges vignettes. (3) Find help on particular functions, e.g.,
library(IRanges) help(package="IRanges") ## overview ?findOverlaps ## specific function
For a more exploratory interface to the help system, try
If you are new to
R, then it will help to enter into the process
knowing that some basic R skills are assumed by the vignettes and help
pages; spend some time learning
Different sources take different approaches to managing annotations. The annotation packages in Bioconductor are based on downloads obtained shortly before each Bioconductor release, and so can lag by six months (at the end of the release cycle) compared to on-line resources. The advantage of this approach is that the annotations do not change unexpectedly during development of an analysis, while the disadvantage is that the resource is not quite up-to-date with current understanding. To find out information about data sources used for each annotation package, try a command analogous to
Bioconductor packages can help further investigate discrepancies, e.g., AnnotationDbi, rtracklayer, Biostrings, and BSgenome (e.g., BSgenome.Hsapiens.UCSC.hg17).
Two relevant mailing list posts
address this. Generally, packages whose code you use in your own
package should where ever possible be Import:'ed. Packages required
for vignettes are often Suggest:'ed. Depends: is appropriate for
packages that cannot be Import:'ed (e.g., because they do not have a
NAMESPACE) or for packages that provide essential functionality needed
by the user of your package, e.g., your functions always return
GRanges objects, so the user will necessarily need
on their search path.
Many packages provide a citation available from within R. Try
for any installed package. To cite the project as a whole, use