[R] Using color and plotting characters in a scatterplot matrix [Newbie Help]

[ONKELINX, Thierry]

First make a factor with the levels.

jet$Classes <- factor(ifelse(jet$amtemp < 90, "low", ifelse(jet$amtemp <
100, "medium", "high")))

Then make life easier and use ggplot

install.packages("ggplot2")
library("ggplot2")
ggplot(jet, aes(x = amtemp, y = thrust, colour = Classes)) +
geom_point()

HTH,

Thierry

------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium 
tel. + 32 54/436 185
Thierry.Onkelinx at inbo.be 
www.inbo.be 

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to
say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of
data.
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
Namens pfc_ivan
Verzonden: woensdag 4 februari 2009 8:59
Aan: r-help at r-project.org
Onderwerp: Re: [R] Using color and plotting characters in a scatterplot
matrix [Newbie Help]


I figured out how to do the rest, the only thing I need to do now is to
somehow change the numbers which are < 90 to a character string "low" .
The
values which are between 100 - 90 to convert to character string
"medium".
And the values larger than 100 to convert to character string "high".
Then I
would use this line. 

plot(thrust~amtemp, jet, col=as.numeric(jet$amtemp),
pch=as.numeric(jet$amtemp))

The thing is that I dont know how to convert those numerical values into
"low" "medium" and "high" 

Hmm, but then when I think about it better if its changed to the strings
above, it wont remember the exact numerical value. 

Basically what I want to do is make a scatterplot and then just change
the
color and the symbol of those 3 groups so they can be distinguished on
the
graph.
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