Thanks for the suggestion! The hash value for my download does match the one listed on the webpage. 

A further complication for R 3.0 is that a program I wrote before works fine with R 3.0 on Mac 10.6, but gives me "Segmentation fault" error with R 3.0 on Mac 10.8: 

*** caught segfault ***
address 0x0, cause 'memory not mapped'

And the program works properly with R 2.15 on both 10.6 and 10.8.

Gang


On Jun 27, 2013, at 1:00 PM, Marc Schwartz wrote:

> 
> On Jun 27, 2013, at 11:44 AM, "Chen, Gang (NIH/NIMH) [C]" <gangchen@mail.nih.gov> wrote:
> 
>> R 3.0.1 does not seem to work properly on two of my Mac notebooks, one with 10.8.2 and the other 10.6.8. When I start R on the terminal, I get the following:
>> 
>> Error in .Call("R_isMethodsDispatchOn", onOff, PACKAGE = "base") :
>> "R_isMethodsDispatchOn" not available for .Call() for package "base"
>> 
>> R version 3.0.1 (2013-05-16) -- "Good Sport"
>> ...
>> 
>> Even the following does not work:
>> 
>>> citation()
>> Error: could not find function "citation"
>> 
>> However, once I downgraded R from 3.0.1 to 3.0, everything works fine. What could be the source of the problem?
>> 
>> Thanks!
>> 
>> Gang
> 
> 
> I would try to download 3.0.1 from a different CRAN mirror. My first guess is that your download was corrupted and/or did not install correctly or fully.
> 
> You could try to test the MD5 hash for the downloaded file. The correct hash value is listed on the download page for OSX:
> 
> In a terminal:
> 
> md5 R-3.0.1.pkg
> MD5 (R-3.0.1.pkg) = c0e6e702742f17cd9b2f2e4cb1c5dcad
> 
> 
> Regards,
> 
> Marc Schwartz
> 
> P.S. to Simon. Should there be a consideration for replacing MD5 with SHA, given the issues with the former?
> 


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