Hi Mustapha,

This is not specific to R, it's the general consensus for all 
computer software versions. Also, it's not like a counting system, so 
you don't have to get to V2.99.99 before you get to V3.0. At some 
point, the developers feel the changes are major enough to warrant 
the upgrade to 3.0 instead of 2.X + 1. And while R 2.9 and R 2.10 may 
seem essentially the same, they are not. If you ever have any 
problems with Bioconductor packages and post to the list, you are 
supposed to post your sessionInfo(), which lists the version numbers. 
If you don't have the most up-to-date version, the only help you will 
get is "Upgrade and mail us back if the problem persists". I've found 
that it only takes about 10 minutes to install the newest version, so 
I definitely get the newest 6 month release (April and October) soon 
after it comes out, and try to do one or two of the minor upgrades in 
the intervening months. That being said, I see there's a R 2.10.1 
available, and I'm running R 2.10.0, so I think I'll upgrade now... 
You should do the same!

Jenny

At 09:59 AM 12/30/2009, you wrote:
>Hi Jenny,
>
>Thanks for your answer and I'm sorry, I'm new on this mailing list 
>and I didn't follow a lot of posts about this issue.
>OK for what you say but, why complicate things when they are simple?
>You imagine the length of versions at V2.10.20, V2.10.3 then 
>V2.20.99, V2.30.99....V2.99.99 before the R3.0 ? We would need a 
>century to get V3.0 :)
>It's a little bit long and not necessary I think !
>I agree with you, there is no big changes between versions for now ! 
>So, 2.10 or 2.9 this is the same !
>
>Mustapha
>
>
>On Wed, Dec 30, 2009 at 4:41 PM, Jenny Drnevich 
><<mailto:drnevich@illinois.edu>drnevich@illinois.edu> wrote:
>Hi Mustapha,
>
>I made the same erroneous conclusion in regards to software version 
>numbers. As I was told, they are NOT decimal places, so since 10 > 
>9, R version 2.10 IS > 2.9.  Which part of the version number is 
>increased for a new version depends on the amount of change from the 
>previous version. There has to be some sort of major change to 
>increase the R version to 3.0  (what caused the change from 1.x to 
>2.0?), otherwise each 6 month upgrade just increases the second 
>number. Likewise, the smaller version changes between the 6 month 
>major upgrades get 2.10.0, 2.10.1, 2.10.2, etc.
>
>HTH,
>Jenny
>
>
>At 09:25 AM 12/30/2009, Mustapha A. wrote:
>Hi every body,
>
>I'm just wondering about the current upgrading of R versions.
>Actually, I have the R version 2.9, but the new version (R 2.10) is already
>availaible.
>Theoritically, a new version is usually higher in number than the previous
>one, but in R versions this is not the case ! Since 2.10 (newer version
>edition) is lower than 2.9 (older version) !
>So, is this a simple error or intentionnaly made as is ?
>
>The proof, mathematically speaking:
>2.10/2.9 =  0.74
>2.9/2.10 = 1.38
>                       then => 2.9 is higher than 2.10 !
>
>So, the new version of R should to be R 3.0.0, right ?
>
>Regards
>Mustapha
>
>        [[alternative HTML version deleted]]
>
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>
>
>Jenny Drnevich, Ph.D.
>
>Functional Genomics Bioinformatics Specialist
>W.M. Keck Center for Comparative and Functional Genomics
>Roy J. Carver Biotechnology Center
>University of Illinois, Urbana-Champaign
>
>330 ERML
>1201 W. Gregory Dr.
>Urbana, IL 61801
>USA
>
>ph: 217-244-7355
>fax: 217-265-5066
>e-mail: <mailto:drnevich@illinois.edu>drnevich@illinois.edu
>

Jenny Drnevich, Ph.D.

Functional Genomics Bioinformatics Specialist
W.M. Keck Center for Comparative and Functional Genomics
Roy J. Carver Biotechnology Center
University of Illinois, Urbana-Champaign

330 ERML
1201 W. Gregory Dr.
Urbana, IL 61801
USA

ph: 217-244-7355
fax: 217-265-5066
e-mail: drnevich@illinois.edu 
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