*Tenho utilizado constantemente o R em 64 e 32 bits sem problemas. Eventualmente alguns pacotes não estão disponíveis para 64 bits.
Quanto aos problemas mencionados, como falado anteriormente, não existem mais. Tenho um projetozinho (muito básico) que para facilitar já tem o R, Gretl, MySql, LaTeX entre outros já instalados por padrão, por enquanto apenas disponível em 32 bits. http://sourceforge.net/projects/ubuntuforstats/ Agora qual a configuração do seu computador? Nem todo processador suporta 64bits! Cabe salientar também que, no caso do R, algumas contas são mais lentas em 64 bits. Direto do FAQ do R: * 2.28 Should I run 32-bit or 64-bit R? For most users (especially beginners) we would recommend using the 32-bit build. The advantage of a native 64-bit application is that it gets a 64-bit address space and hence can address far more than 4GB (how much depends on the version of Windows, but in principle 8TB). This allows a single process to take advantage of more than 4GB of RAM (if available) and for R's memory manager to more easily handle large objects (in particular those of 1GB or more). The disadvantages are that all the pointers are 8 rather than 4 bytes and so small objects are larger and more data has to be moved around, and that less external software is available for 64-bit versions of the OS. The toolchain (compilers, linkers, ...) used to build 64-bit R is less mature than that for 32-bit R, but testing so far (and all the CRAN packages provide an extensive test suite) suggests that they are mature enough for production use. The compilers are able to take advantage of extra features of all x86-64 chips (more registers, SSE2/3 instructions, ...) and so the code may run faster despite using larger pointers. For advanced users the choice may be dictated by whether the contributed packages needed are available in 64-bit builds (and if they are not that is some indication that installing them from sources is problematic). At the time of writing the most commonly-used CRAN packages without 64-bit versions were BRugs and rggobi. The considerations can be more complex: for example 32/64-bit RODBC need 32/64 ODBC drivers respectively, and where both exist they may not be able to be installed together. An extreme example is the Microsoft Access/Excel ODBC drivers: if you have installed 64-bit Microsoft Office you can only install the 64-bit drivers and so need to use 64-bit RODBC and hence R. 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 – simply select both when using the installer. You can also go back and add 64-bit components to a 32-bit install. For many Registry items, 32- and 64-bit programs have different views of the Registry, but clashes can occur. The most obvious problem is the file association, which will use the last installation for which this option is selected, and if that was for an installation of both, will use 32-bit R. * *Atenciosamente, Leandro Marino http://www.leandromarino.com.br (Fotógrafo) http://est.leandromarino.com.br/Blog (Estatístico) Cel.: + 55 21 9845-7707 Cel.: + 55 21 8777-7907 -- Mais sobre o Ubuntu em português: http://www.ubuntu-br.org/comece Lista de discussão Ubuntu Brasil Histórico, descadastramento e outras opções: https://lists.ubuntu.com/mailman/listinfo/ubuntu-br
