On 13.05.2010 09:29, Henrik Bengtsson wrote:
In 'R for Windows FAQ' for R version 2.11.0 Patched (2010-05-11 r51982) you can read: [2.29] Can both 32- and 64-bit R be installed on the same machine? Obviously, only relevant if the machine is running a 64-bit version of Windows. Yes, with a little care. For R 2.11.x they should be installed into different directories: the installer will suggest that the 64-bit build is installed into, say, R-2.11.0-x64 and Administrator installs will default to different paths (e.g. C:\Program Files (x86)\R for 32-bit, C:\Program Files\R for 64-bit). The Start Menu, desktop and quick launch icons will be named differently, and the versions can be uninstalled independently. Aren't those paths vice versa? 32-bit: C:\Program Files\R 64-bit: C:\Program Files (x86)\R
No: This is MS decision and it is consequent: Under 64-bit Windows, the default is to use 64-bit Applications (hence in "Program Files") and 32-bit applications go into "Program Files (x86)". x86 for the old 32-bit x86 architecture.
(I've noticed that this paragraph is not in R v2.12.0 dev).
Right, since it is planned to release R-2.12.0 as a bi-arch distribution, i.e. just one installer that contains both 32-bit and 64-bit binaries and will (if you select to install both) install the binaries in subdirectories of bin/ lib/ etc.
But this is still heavily under development and the CRAN checks are not yet complete.
Uwe Ligges
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