Thanks for your answer, but it doesn't work...
Here is what I get:
> ssfamean <- aggregate(ssfa[[10:24]],ssfa[c("SPECSHOR", "BONE",
"TO_POS", "FACETTE", "SHEARFAC", "ENA_BA")],mean)
Error in .subset2(x, i, exact = exact) :
recursive indexing failed at level 2
I think I've tried everything that came to my mind: ssfa[[10:24]],
ssfa[[10]]:ssfa[[24]] and with only one pair of bracket (it's the
beginner's method!)
Also col_index <- match("Asfc", ssfa) doesn't really work since
col_index is composed of 1227 NAs...
Any other idea?
Ivan
b k a écrit :
> On Mon, Jan 18, 2010 at 9:53 AM, Ivan Calandra
> <ivan.calan...@uni-hamburg.de <mailto:ivan.calan...@uni-hamburg.de>>
> wrote:
>
> Hi everybody!
>
> I'm working on R today so I have a lot of questions (you may have
> noticed that it's the 3rd email today). I'm new on R, so please excuse
> the "spam"!
>
> I have a dataset "ssfa" with many rows and the column names are:
> > names(ssfa)
> [1] "SPECSHOR" "BONE" "TO_POS" "MEASUREM" "FACETTE"
> "SHEARFAC"
> [7] "ENA_BA" "SEL_FACET" "SEL_MEAS" "Asfc" "Smc"
> "epLsar"
> [13] "HAsfc4" "HAsfc9" "HAsfc16" "HAsfc25" "HAsfc36"
> "HAsfc49"
> [19] "HAsfc64" "HAsfc81" "HAsfc100" "HAsfc121" "Tfv"
> "Ftfv"
>
> I want to aggregate that way:
> ssfamean <- aggregate(ssfa[c("Asfc", "Smc", "epLsar", "HAsfc4",
> "HAsfc9", "HAsfc16", "HAsfc25", "HAsfc36", "HAsfc49", "HAsfc64",
> "HAsfc81", "HAsfc100", "HAsfc121", "Tfv", "Ftfv")], ssfa[c("SPECSHOR",
> "BONE", "TO_POS", "FACETTE", "SHEARFAC", "ENA_BA")], mean).
>
> As you can see, it is very long since I have many variables.
> Basically I
> want to select all numerical variables (10 to 24), and all categorical
> variables except MEASUREM, SEL_FACET and SEL_MEAS without having to
> write each of them. I would also like to avoid writing the names, the
> indexes would be nice.
> I tried with:
> > ssfamean <- aggregate(ssfa[c(ssfa[[10]]:ssfa[[24]])],
> ssfa[c("SPECSHOR", "BONE", "TO_POS", "FACETTE", "SHEARFAC",
> "ENA_BA")],
> mean)
> but it obviously doesn't work (well "obviously"...)
>
>
> Numeric column indexing?
>
> eg:
> ssfa[10:24]
> ssfa[[10:24]] #list including column name
>
> col_index <- match("Asfc", ssfa)
> total_num_cols <- 14
> ssfa[col_index:total_num_cols]
>
>
> I'm new at R also but that's how I would approach it.
>
> Ben K.
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