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This will remove all but the top level of .libPaths(), which should be the base packages installed with R, and adds a second directory, the libPath.
libPath
newLibPaths(libPath)
A path that will be the new .libPaths()[1]
Invisibly the new .libPaths()
.libPaths()
# NOT RUN { newLibPaths("testPackages") .libPaths() # new .libPaths # }
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