R help - Nov 2011 - Frequency table

Hello everybody
 
I am new on R
I have some problem when i try to obtain frequency table
which script do I need to write in R in order to obtain the frecuency of a
value per repetition
You could see my example

Var.           rep           x              I need to obtain these
201            1               1            201 the x=1 (repeat once), x=3
(repeat 3 times)
201            2               3            202 the X=1 (repeat 2 twice),
the x=3 (repeat once),
201            3               3            203 the X=2 (rep 3 veces), valor
3 (rep 2veces)
201            4               3         
202            1               1             How can I do on R?
202            2               1
202            3               3
202            4               5
203            1               2
203            2               2
203            3               3
203            3               3


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Hi,

I think you can try the function rep().

Example:
# this means rep 1 once, 2 twice and 3 three times
> rep(c(1,2,3), c(1,2,3))
[1] 1 2 2 3 3 3

# this means rep "A", "B", "C", until it reaches
length of 10
> rep(c("A","B","C"), length.out = 10)
 [1] "A" "B" "C" "A" "B"
"C" "A" "B" "C" "A"

you can try more example by type:
?rep

hope this helps~

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I think something like this is what you are looking for, but to be
honest, I don't quite understand what you are looking for: can you
actually write out the desired result:

tapply(df$x, df$Var, table)

where df is the name of your data.

df <- structure(list(Var = c(201L, 201L, 201L, 201L, 202L, 202L, 202L,
202L, 203L, 203L, 203L, 203L), rep = c(1L, 2L, 3L, 4L, 1L, 2L,
3L, 4L, 1L, 2L, 3L, 3L), x = c(1L, 3L, 3L, 3L, 1L, 1L, 3L, 5L,
2L, 2L, 3L, 3L)), .Names = c("Var", "rep", "x"),
class = "data.frame",
row.names = c(NA,
-12L))

Michael

On Wed, Nov 23, 2011 at 4:07 PM, reynaldo_ns <reynaldo_ns at hotmail.com>
wrote:
> Hello everybody
>
> I am new on R
> I have some problem when i try to obtain frequency table
> which script do I need to write in R in order to obtain the frecuency of a
> value per repetition
> You could see my example
>
> Var. ? ? ? ? ? rep ? ? ? ? ? x ? ? ? ? ? ? ?I need to obtain these
> 201 ? ? ? ? ? ?1 ? ? ? ? ? ? ? 1 ? ? ? ? ? ?201 the x=1 (repeat once), x=3
> (repeat 3 times)
> 201 ? ? ? ? ? ?2 ? ? ? ? ? ? ? 3 ? ? ? ? ? ?202 the X=1 (repeat 2 twice),
> the x=3 (repeat once),
> 201 ? ? ? ? ? ?3 ? ? ? ? ? ? ? 3 ? ? ? ? ? ?203 the X=2 (rep 3 veces),
valor
> 3 (rep 2veces)
> 201 ? ? ? ? ? ?4 ? ? ? ? ? ? ? 3
> 202 ? ? ? ? ? ?1 ? ? ? ? ? ? ? 1 ? ? ? ? ? ? How can I do on R?
> 202 ? ? ? ? ? ?2 ? ? ? ? ? ? ? 1
> 202 ? ? ? ? ? ?3 ? ? ? ? ? ? ? 3
> 202 ? ? ? ? ? ?4 ? ? ? ? ? ? ? 5
> 203 ? ? ? ? ? ?1 ? ? ? ? ? ? ? 2
> 203 ? ? ? ? ? ?2 ? ? ? ? ? ? ? 2
> 203 ? ? ? ? ? ?3 ? ? ? ? ? ? ? 3
> 203 ? ? ? ? ? ?3 ? ? ? ? ? ? ? 3
>
>
> --
> View this message in context:
http://r.789695.n4.nabble.com/Frequency-table-tp4101612p4101612.html
> Sent from the R help mailing list archive at Nabble.com.
>
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