R help - Aug 2007 - ggplot2 qplot and add

Hi there,

I have some simple frequencies I want to plot into one graph.  I had it
working, and now I can't figure out whats going wrong.  All the data is
stored in a dataframe, and i finally managed to order the factor correctly!
Each column is a variable and contains integers for the same set of values
in the column that contains the headers for each row (graphLabels).

So, I get the data and my first call is:
app <- qplot(appetitive.stimulus, graphLabels, data=related.differences,
size=variance, colour="Appetitive Stimulus", xlim=c(-20,20),
main="Title
here", xlab="Differences", ylab="Header Concepts")

which works great. Now, there are 16 columns in my dataframe that I want to
output together, so i tried the following:
ave <- qplot(aversive.stimulus, graphLabels, data=related.differences,
size=variance, colour="Aversive Stimulus", xlim=c(-20,20),
main="Title
here", xlab="Differences", ylab="Header Concepts",
add=app)

which according to what i can find (and actually got working at some point)
should add the data from the two columns to the same graph.  However, that
is not what is happening now.  The 'add' parameter does add the first
plot
object, but instead of both sets of data appearing, only 'app' appears
in
the output. If I remove the 'add' command, 'ave' outputs
correctly.  What am
i doing wrong here? It feels like I'm missing something ridiculously
apparent.

Thanks for your help!
emilio

	[[alternative HTML version deleted]]

I think you need something like.

qplot(appetitive.stimulus, graphLabels, data=related.differences,
size=variance, colour="Appetitive Stimulus", xlim=c(-20,20),
main="Title
here", xlab="Differences", ylab="Header Concepts") +
geom_point(aes(colour = "Aversive Stimulus"))

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 op inbo.be
www.inbo.be 

Do not put your faith in what statistics say until you have carefully
considered what they do not say.  ~William W. Watt
A statistical analysis, properly conducted, is a delicate dissection of
uncertainties, a surgery of suppositions. ~M.J.Moroney

 
> -----Oorspronkelijk bericht-----
> Van: r-help-bounces op stat.math.ethz.ch 
> [mailto:r-help-bounces op stat.math.ethz.ch] Namens Emilio Gagliardi
> Verzonden: donderdag 2 augustus 2007 19:11
> Aan: r-help op stat.math.ethz.ch
> Onderwerp: [R] ggplot2 qplot and add
> 
> Hi there,
> 
> I have some simple frequencies I want to plot into one graph. 
>  I had it working, and now I can't figure out whats going 
> wrong.  All the data is stored in a dataframe, and i finally 
> managed to order the factor correctly!
> Each column is a variable and contains integers for the same 
> set of values in the column that contains the headers for 
> each row (graphLabels).
> 
> So, I get the data and my first call is:
> app <- qplot(appetitive.stimulus, graphLabels, 
> data=related.differences, size=variance, colour="Appetitive 
> Stimulus", xlim=c(-20,20), main="Title here", 
> xlab="Differences", ylab="Header Concepts")
> 
> which works great. Now, there are 16 columns in my dataframe 
> that I want to output together, so i tried the following:
> ave <- qplot(aversive.stimulus, graphLabels, 
> data=related.differences, size=variance, colour="Aversive 
> Stimulus", xlim=c(-20,20), main="Title here", 
> xlab="Differences", ylab="Header Concepts", add=app)
> 
> which according to what i can find (and actually got working 
> at some point) should add the data from the two columns to 
> the same graph.  However, that is not what is happening now.  
> The 'add' parameter does add the first plot object, but 
> instead of both sets of data appearing, only 'app' appears in 
> the output. If I remove the 'add' command, 'ave' outputs 
> correctly.  What am i doing wrong here? It feels like I'm 
> missing something ridiculously apparent.
> 
> Thanks for your help!
> emilio
> 
> 	[[alternative HTML version deleted]]
> 
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