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A general description is here.
‘rep()’ is faster and uses less memory, substantially so in some common
cases (e.g. if ‘times’ is of length one or ‘length.out’ is given, and
‘each = 1’).
For a Windows or Mac OS X binary package install, ‘install.packages()’ will check if a source package is available on the same repositories, and report if it is a later version or there is a source package but no binary package available.
This check can be suppressed: see the help page.
‘install.packages(type = "both")’ has been enhanced. In interactive use it will ask whether to choose the source version of a package if the binary version is older and contains compiled code, and also asks if source packages with no binary version should be installed).
‘rep()’ is faster and uses less memory, substantially so in some common cases (e.g. if ‘times’ is of length one or ‘length.out’ is given, and ‘each = 1’).