[R] ggplot2

[ONKELINX, Thierry]

Dear Vikas,

First a few remarks:
- as we don't have your dataset, your example is not reproducible.
Please do add a (dummy) dataset next time.
- adding spaces makes code much more readable.
- why do you use scale_colour_gradient2 if you set the midpoint at the
lower level? Use scale_colour_gradient instead.
- You will have to tell us what the "desired" labels should look like. 


I tried to figure out what your data looks like an created an example
that works. Let us know if that is what you want.

n <- 20
nPhase <- 5
b3 <- expand.grid(Year = seq_len(n), Phase = runif(nPhase, min = 1, max
= 2))
b3$CDR <- rnorm(nrow(b3))
qplot(Year, CDR, data=b3,colour=Phase, group = Phase,
geom=c("point","line"),legend.position="bottom")
+scale_colour_gradient(limits=c(1,2), low="magenta",
high="darkblue",breaks=c(1,2),labels=c("a","b"))
 


------------------------------------------------------------------------
----
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 Vikas Rawal
Verzonden: donderdag 22 januari 2009 17:59
Aan: r-help at r-project.org
Onderwerp: [R] ggplot2

I have been struggling to get the legends in ggplot2 right or do away
with them altogether (on which I have already sent a post). 

In the following code, the labels argument in the scale_colour_gradient2
does not give me the desired labels in the legend. Could someone
explain?

qplot(Year,CDR,data=b3,colour=Phase,geom=c("point","line"),legend.positi
on="bottom")->p
p+scale_colour_gradient2(limits=c(1,2), midpoint=1,low="magenta",
mid="magenta", high="darkblue",breaks=c(1,2),labels=c("a","b")->p
p

Vikas


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