Thanks Brian. That worked. I also wanted to increase the size of the
'points' on the graph. Is there any way I can get rid of the 'legend' (in
this case '3') appearing on the plot?

======= code ====
    library(ggplot2)

    leaves <- letters[1:8]
    mat <- matrix(sample(1:1000,32),nrow=16,ncol=2)
    colnames(mat) <- paste('t',1:2,sep='')
    df <- as.data.frame(cbind(mat,leaves))

    vals <- 1:length(leaves)
    names(vals) <- leaves

    p <- ggplot(df,aes(t1,t2))
    p + aes(shape = factor(leaves)) + geom_point(aes(colour =
factor(leaves),size=3)) + scale_shape_manual(values=vals)


=========

thanks!


On Mon, Apr 16, 2012 at 3:09 PM, Brian Diggs <diggsb@ohsu.edu> wrote:

> On 4/16/2012 7:31 AM, Brian Smith wrote:
>
>> Hi,
>>
>> I was trying to replicate one of the graphs given on the ggplot2 website.
>> I
>> have given a sample code below. I would like to combine the legends, since
>> each color is uniquely mapped to a shape.
>>
>> ###
>>     library(ggplot2)
>>
>>     leaves<- letters[1:8]
>>     mat<- matrix(sample(1:1000,32),nrow=**16,ncol=2)
>>     colnames(mat)<- paste('t',1:2,sep='')
>>     df<- as.data.frame(cbind(mat,**leaves))
>>
>>     vals<- 1:length(leaves)
>>     names(vals)<- leaves
>>
>>     p<- ggplot(df,aes(t1,t2))
>>     p + aes(shape = factor(leaves)) + geom_point(aes(colour =
>> factor(leaves))) + scale_shape_manual("",values=**vals)
>>
>> ####
>>
>> Which parameter do I need to change?
>>
>
> add scale_colour_discrete("") to your call. In order for scales to be
> combined, the breaks, labels, and title must all be the same. You had
> breaks and labels the same, but not the title.  Alternatively, change the
> scale_shape_manual call to scale_shape_manual(values=**vals).
>
>
>  thanks!
>>
>
>
> --
> Brian S. Diggs, PhD
> Senior Research Associate, Department of Surgery
> Oregon Health & Science University
>
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