R help - Aug 2012 - ggplot2 with separate average lines

Hi I'm just starting off with R but is this correct?

I have this data set.
> data
   Type     ID Size
1  Reqd 244808 1024
2  Reqd 244045  512
3  Reqd 245427  800
4  Reqd 245423 1024
5  Reqd 244983 1024
6  Used 244808  615
7  Used 244045   33
8  Used 245427  261
9  Used 245423  461
10 Used 244983 1194

I want a scatterplot of the Size values grouped by the Type column.
I also want 2 lines showing each group's "average".
> library(ggplot2)
> data <- read.table("mem.dat", header=T, sep=",")
> attach(data)
> ggplot(data.frame(Type, ID, Size), aes(x=ID, y=Size, shape=Type,
color=Type))
    + geom_point(shape=1) + scale_fill_hue(l=40)
    + geom_line(stat="hline", yintercept=mean,
linetype="dashed")
>
Regards,
Alan

	[[alternative HTML version deleted]]

Looks like it works :)

I'd suggest not using attach().  It can cause problems in some cases.

gglot2 is set up to read the relevant data frame so 

p  <-  ggplot( data  , aes( Whatever.  )) + and so on

However "data" is a defined function in R so something like mydata or
df1 is a better choice.
John Kane
Kingston ON Canada

> -----Original Message-----
> From: alan.miller at synopsys.com
> Sent: Wed, 8 Aug 2012 15:32:23 +0000
> To: r-help at r-project.org
> Subject: [R] ggplot2 with separate average lines
> 
> Hi I'm just starting off with R but is this correct?
> 
> I have this data set.
>> data
>    Type     ID Size
> 1  Reqd 244808 1024
> 2  Reqd 244045  512
> 3  Reqd 245427  800
> 4  Reqd 245423 1024
> 5  Reqd 244983 1024
> 6  Used 244808  615
> 7  Used 244045   33
> 8  Used 245427  261
> 9  Used 245423  461
> 10 Used 244983 1194
> 
> I want a scatterplot of the Size values grouped by the Type column.
> I also want 2 lines showing each group's "average".
> 
>> library(ggplot2)
>> data <- read.table("mem.dat", header=T, sep=",")
>> attach(data)
>> ggplot(data.frame(Type, ID, Size), aes(x=ID, y=Size, shape=Type,
>> color=Type))
>     + geom_point(shape=1) + scale_fill_hue(l=40)
>     + geom_line(stat="hline", yintercept=mean,
linetype="dashed")
>> 
> 
> Regards,
> Alan
> 
> 	[[alternative HTML version deleted]]
> 
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