Hi Michael, Rune,

I checked with R 3.0.3, using sudo aptitude install r-base=3.0.3-1precise0
r-base-core=3.0.3-1precise0 r-recommended=3.0.3-1precise0
and it seems it can be really a regression (now with 3.0.3 my problem has
disappeared)

I posted some hours ago on Stack Overflow
http://stackoverflow.com/questions/22912936/why-r-returns-na-when-computing-mean-on-non-null-matrix/22913923#22913923

I think that read.table forces a matrix to be non numeric, while I checked
and all the matrix is only composed by floats. Having non numeric data does
not allow to do operations on this. Unfortunately I cannot disclose the
dataset. However if I can tell you more ask me.

Thanks

~ Francesco Brundu


On 7 April 2014 17:26, Michael Rutter <mar36@psu.edu> wrote:

> On 04/07/2014 11:15 AM, Francesco Brundu wrote:
>
>> Hi all,
>> I am writing to you since I think I am experiencing a regression on the
>> latest beta release, R version 3.1.0 beta (2014-03-28 r65330) -- "Spring
>> Dance" .. Since I need to check for it before posting, I was searching for
>> a method to revert to version 3.0.2 in Ubuntu, but I was unable to find
>> it.
>> Could you please give me some hints?
>>
>> Thanks
>> ~ Francesco Brundu
>>
>>
> Francesco,
>
> Here are some details on installing previous versions of R in Ubuntu.
>
> http://stackoverflow.com/questions/17935292/install-
> previous-versions-of-r-on-ubuntu
>
> You can also use synaptic or apt if you have the CRAN Ubuntu repositories
> enabled (as detailed above).
>
> https://help.ubuntu.com/community/SynapticHowto#How_
> to_force_the_installation_of_a_package_version
>
> https://help.ubuntu.com/community/PinningHowto
>
> If you are having an issue with 3.1.0, please let me know.  It will
> officially be released on Thursday, at which point I will be pushing out
> that update.  If there are issues, they need to be addressed.
>
> Michael
>
> --
> Dr. Michael A. Rutter
> Associate Professor of Statistics
> Program Coordinator, Mathematics
> Penn State Erie, The Behrend College
> Station Road
> Erie, PA 16563
> http://math.bd.psu.edu/faculty/rutter
>
>
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