[R] Plot factors with a loop

[baptiste auguie]

Hi,

>From what I understand, I would suggest the following strategy,

1- combine all data in a single data.frame (see merge, rbind, reshape
package, etc.)

2- plot all data at once using a formula like this,

boxplot(d~f,data=df)

HTH,

baptiste

2009/9/20 Sam Player <samtplayer at gmail.com>:
> # I have a dataframe with a factor and data:
>
> a <- rep(c("a", "b"), c(6,6))
> df <- data.frame(f=a, d=rnorm(12))
> df
>
> # I want to make a single plot with boxplots of each factor. I need to do it
> via a loop as I would like to apply it to other dataframes with many
> factors. The following is a loop that produces a boxplot of the last factor,
> which overwrites the previous factor.
>
> for (i in levels(df$f)){
>        z <- assign(as.character(i), as.vector(df[df$f==i,2],
> mode="numeric"))
>        boxplot(z)
>        }
>
> # How can I stop the first factor being overwritten so that two boxplots are
> displayed in the plot. The result I need is also produced by:
>
> boxplot(df[df$f=="a",2], df[df$f=="b",2])
>
> # but I need it to be done through the loop. Thanks in advance!
>
> # Sam
>
> --
> Sam Player, B.Sc.(Hons.) B.A.
> Ph.D. Candidate, Faculty of Agriculture, Food & Natural Resources,
> University of Sydney
>
> Email: splayer at usyd.edu.au
>
> Agroecosystems Research Group
> Room 214 J.R.A. McMillan Building A05
> University of Sydney NSW 2006, Australia
>
> Angkor Research Program
> Room 305 Old Teachers College A22
> University of Sydney NSW 2006, Australia
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>