On 9/5/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> Dear All:
> I need to have some data frame objects.
> First aa object:
> pH Formulation time Subject
> [1]1.2 F 0 1
> [2]7.4 S 1 2
> [3] MF 2 3
> [4] 3 4
> [5] n i
> Then, I need to produce 2*3(pH*formulation) different
> tables. This table includes column of (pH,
> Formulation, time S1 S2 S3 …..Si) and S1= subject
> 1, S2=subject 2 and so on. For example: bb1 table
> pH Formulation time S1 S2 S3….Si
> [1]1.2 F 0
> [2] 1
> [3] 2
> [4] 3
> [5] n
>
> For example: bb2 table
> pH Formulation time S1 S2 S3….Si
> [1]1.2 S 0
> [2] 1
> [3] 2
> [4] 3
> [5] n
>
>
> Moreover, the values of pH and Formulation column are
> the combination questions. The values of pH and
> Formulation column should be the combinations such as
> (1.2, F), (1.2, S), (1.2, MF), (7.4, F), (7.4, S),
> (7.4, MF)
> I am a beginner level in R and I have no idea how to
> do this. Could any one please help me. Thanks a
> lot!!!
>
> Best regrards
> Hsin Ya Lee
>
I don't understand exactly what you want but perhaps start with this:
expand.grid(pH = c(1.2, 7.4), Formulation = c("F", "S", "MF"))
Hope this helps,
Stephen
--
Rochester, Minn. USA
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