[R] plotting

[David L Carlson]

It is easy to do in base graphics, but probably a bad idea just because it
is very hard to decode the symbol/color combinations. I added a crude
legend:

# Provide reproducible data
set.seed(42)
value <- round(rnorm(20), 2)
time <- round(runif(20)*10, 1)
group <- sample(1:4)
id <- sample(1:5)
dta <- data.frame(value, time, group, id)

# Plot and legend
plot(value~time, pch=id+20, col=group, bg=group, cex=1.25)
legend("bottomright", as.character(1:4), pch=16, 
  col=1:4, bty="n", inset=c(0, .045), title="Group")
legend("bottomright", as.character(1:5), pch=21:25, col="gray", 
  inset=c(.1, 0), bty="n", title="ID")

----------------------------------------------
David L Carlson
Associate Professor of Anthropology
Texas A&M University
College Station, TX 77843-4352




> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of R. Michael Weylandt
> Sent: Thursday, March 14, 2013 10:51 AM
> To: li li
> Cc: r-help
> Subject: Re: [R] plotting
> 
> I think you'll find this easiest with ggplot2:
> 
> library(ggplot2)
> 
> ggplot(dat, aes(x = value, y = time, color = group, symbol = id)) +
> geom_point()
> # symbol = might not be the right argument -- I'm doing this from
> memory
> 
> or similar....
> 
> MW
> 
> On Thu, Mar 14, 2013 at 3:46 PM, li li <hannah.hlx at gmail.com> wrote:
> > Hi alL,
> >    I have a data frame with 4 columns: "value", "time",  "group" and
> "id".
> >    I would like to plot "value" vs. "time" with different colors for
> > different levels of "group" and
> > different symbols for different values of "id".
> >    I think I could do this but I would like to see what is an easier
> way to
> > plot
> > the data this way.
> >    Thank you vey much.
> >      Hanna
> >
> >         [[alternative HTML version deleted]]
> >
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