version_management.md
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@@ -63,3 +63,32 @@ If the version of a title is not available on your platform you can install that
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./biogrids install samtools@1.7
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BioGrids versions are retained for every title. We do not delete or remove versions of any title. If you are unable to find the version you need or have difficulty installing, please send a note to help@biogrids.org.
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+## Using older R packages
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+Since Janurary 2020, BioGrids maintains all versions of R packages that have been installed in thet latest BioGrids R.
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+When new packages are installed or updated the previous set of packages is marked obsolete and archived. This happens approximately once per month.
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+You can use these older versions of R packages by requesting the obsolete package archive. Send email to:
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+help@biogrids.org
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+specifying either a specific version of an R package or the date you were using the version. We will restore the set of R packages that contains the version you need.
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+Once updated on your site you can use these older R packages by specifying them in your .libPaths() within R.
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+The path to R library packages in BioGrids is of the form:
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+/programs//x86_64-linux//r/3.6.2/r-pkgs/20200305
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+This path refers to R version 3.6.2 with a package directory named with a date: 20200305
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+To use packages from this directory, load the path using the .libPaths() function:
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+> \>.libPaths("/programs//x86_64-linux//r/3.6.2/r-pkgs/20200305")
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+Packages found in this directory will be loaded first.
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+To verify a package version use the packageVersion() funtcion.
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