HI Pedro,thank you.

What I am attempting to do here is to find differences in four replicate
measurements. Therefore, I defined Biorep for later use in the target file:

Target File
                    X         FileName Treatment GErep Biorep Culture Array
41745_1_3_21 6moC1Gy1 41745_1_3_21.txt       1Gy     2      1    6moC 41745
41844_1_2_22 6moC1Gy2 41844_1_2_22.txt       1Gy     2      2    6moC 41844
41744_1_2_23 6moC1Gy3 41744_1_2_23.txt       1Gy     2      3    6moC 41744
41743_1_3_24 6moC1Gy4 41743_1_3_24.txt       1Gy     2      4    6moC 41743

On the R console:

> targets$Treatment
[1] 1Gy 1Gy 1Gy 1Gy
Levels: 1Gy

> targets$GErep
[1] 2 2 2 2

If I add a sample, in my targets, with a different $Treatment, I no longer
get the error that I was reporting. Perhaps I a not getting why there should
be different treatments in the targets.
This works fine:

Target File
                    X         FileName Treatment GErep Biorep Culture Array
41741_1_1_1      t0Cn  41741_1_1_1.txt        Cn     1      1      t0 41741
41745_1_3_21 6moC1Gy1 41745_1_3_21.txt       1Gy     2      1    6moC 41745
41844_1_2_22 6moC1Gy2 41844_1_2_22.txt       1Gy     2      2    6moC 41844
41744_1_2_23 6moC1Gy3 41744_1_2_23.txt       1Gy     2      3    6moC 41744
41743_1_3_24 6moC1Gy4 41743_1_3_24.txt       1Gy     2      4    6moC 41743

Thank you for your insight.
Yours
Massimo

On Mon, Apr 27, 2009 at 10:08 PM, Pedro Lopez-Romero <
plromero1.bioc@gmail.com> wrote:

> Hi again Massimo,
> please, show me as well what you have in  your targets$GErep
>
> p.-
>
> On Mon, Apr 27, 2009 at 4:01 PM, Pedro Lopez-Romero <
> plromero1.bioc@gmail.com> wrote:
>
>> Hi Massimo, can you show me what you have in targets$Treatment?
>>
>> p.-
>>
> --
Massimo Pinto
Post Doctoral Research Fellow
Enrico Fermi Centre and Italian Public Health Research Institute (ISS), Rome
http://claimid.com/massimopinto

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