R help - Oct 2011 - extract data for specific levels factor

Dear all,

I'm trying to analyze data with the following structure:

ind          cat            tx      age
40.2 por fol peq     vh        35
41.9 por fol med     vh        35
68.9 por fol preov   vh       35
71.5 por fol peq      ser       37
67.5  por fol med    ser       37
76.9  por fol preov   ser     37
78.7  por fol peq      otr      37
78.3  por fol med    otr       37
82.1  por fol preov   otr      37
83.9  por fol peq      vh       37
80.6  por fol med      vh      37
76.1  por fol preov     vh     37
86.9  por fol peq        ser     35
97.7  por fol med       ser     35
62.3  por fol preov     ser     35



I want to separate exclusively some of factor levels  (?por fol peq?
in the ?cat? colum). I am using ggplot2  and I only can plot all of
factors, not separately. I did try ddply without success.
Any help is welcome.

Andr?s

Hi,

2011/10/25 Andr?s Arag?n <armandres at gmail.com>:
> Dear all,
>
> I'm trying to analyze data with the following structure:
>
> ind ? ? ? ? ?cat ? ? ? ? ? ?tx ? ? ?age
> 40.2 por fol peq ? ? vh ? ? ? ?35
> 41.9 por fol med ? ? vh ? ? ? ?35
> 68.9 por fol preov ? vh ? ? ? 35
> 71.5 por fol peq ? ? ?ser ? ? ? 37
> 67.5 ?por fol med ? ?ser ? ? ? 37
> 76.9 ?por fol preov ? ser ? ? 37
> 78.7 ?por fol peq ? ? ?otr ? ? ?37
> 78.3 ?por fol med ? ?otr ? ? ? 37
> 82.1 ?por fol preov ? otr ? ? ?37
> 83.9 ?por fol peq ? ? ?vh ? ? ? 37
> 80.6 ?por fol med ? ? ?vh ? ? ?37
> 76.1 ?por fol preov ? ? vh ? ? 37
> 86.9 ?por fol peq ? ? ? ?ser ? ? 35
> 97.7 ?por fol med ? ? ? ser ? ? 35
> 62.3 ?por fol preov ? ? ser ? ? 35
>
>
>
> I want to separate exclusively some of factor levels ?(?por fol peq?
> in the ?cat? colum). I am using ggplot2 ?and I only can plot all of
> factors, not separately. I did try ddply without success.
> Any help is welcome.
This kind of question is *so* much easier to answer if you provide
reproducible data with dput(). This is untested because of lack of
data, but what about

newdata <- origdata[origdata$cat %in% c("por", "fol",
"peq"),]

Depending on the effect you want, you may also wish to drop the
unused levels or reorder the levels using factor().

Sarah

-- 
Sarah Goslee
http://www.functionaldiversity.org

Are you trying to separate the substrings in cat? If so, one way is to
use the colsplit() function in the reshape2 package, something like
(untested since you did not provide a suitable data format with which
to work):

library('reshape2')
splitcat <- colsplit(mydata$cat, ' ', names = c('fat',
'bat', 'rat'))
moredat <- cbind(mydata, splitcat)

Other options that might pertain to your request include:

(i) subset(mydata, cat == 'por fol pec')
which you can use as a data argument inside ggplot2 - e.g.,

ggplot(subset(mydata, cat == 'por fol pec'), aes(x = age, y = ind)) +
   geom_point()

(ii) use faceting to get individual plots by factor level of cat - e.g.,
ggplot(mydata, aes(x = age, y = ind)) +
   geom_point() +
   facet_grid( ~ cat)

Hope that one of these is close to the bullseye...
Dennis


2011/10/25 Andr?s Arag?n <armandres at gmail.com>:
> Dear all,
>
> I'm trying to analyze data with the following structure:
>
> ind ? ? ? ? ?cat ? ? ? ? ? ?tx ? ? ?age
> 40.2 por fol peq ? ? vh ? ? ? ?35
> 41.9 por fol med ? ? vh ? ? ? ?35
> 68.9 por fol preov ? vh ? ? ? 35
> 71.5 por fol peq ? ? ?ser ? ? ? 37
> 67.5 ?por fol med ? ?ser ? ? ? 37
> 76.9 ?por fol preov ? ser ? ? 37
> 78.7 ?por fol peq ? ? ?otr ? ? ?37
> 78.3 ?por fol med ? ?otr ? ? ? 37
> 82.1 ?por fol preov ? otr ? ? ?37
> 83.9 ?por fol peq ? ? ?vh ? ? ? 37
> 80.6 ?por fol med ? ? ?vh ? ? ?37
> 76.1 ?por fol preov ? ? vh ? ? 37
> 86.9 ?por fol peq ? ? ? ?ser ? ? 35
> 97.7 ?por fol med ? ? ? ser ? ? 35
> 62.3 ?por fol preov ? ? ser ? ? 35
>
>
>
> I want to separate exclusively some of factor levels ?(?por fol peq?
> in the ?cat? colum). I am using ggplot2 ?and I only can plot all of
> factors, not separately. I did try ddply without success.
> Any help is welcome.
>
> Andr?s
>
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