The following is what I get when I run the code.


> library(ggplot2)
Loading required package: reshape
Loading required package: plyr

Attaching package: 'reshape'

The following object(s) are masked from 'package:plyr':

    rename, round_any

Loading required package: grid
Loading required package: proto
> library(reshape2)

Attaching package: 'reshape2'

The following object(s) are masked from 'package:reshape':

    colsplit, melt, recast

>
> A  <-  data.frame( m = (rep("A", 10)) , b=rnorm(10), c = rnorm(10))
> B  <-  data.frame( m = (rep("B", 10)) , b=rnorm(10), c = rnorm(10))
> C  <-  data.frame( m = (rep("C", 10)) , b=rnorm(10), c = rnorm(10))
>
> mydata  <-  rbind( A, B, C )
> names(mydata)  <-  c( "group", "k1", "k2" )
> mdata  <-  melt(mydata)
Using group as id variables
>
> p  <-  ggplot( mdata , aes(variable, value , colour = variable )) +
geom_boxplot() +
+           facet_grid( group ~ .)
> p
Error in rq.fit.br(x, y, tau = tau, ...) : Singular design matrix
In addition: Warning message:
In is.na(rows) : is.na() applied to non-(list or vector) of type 'NULL'
>


And my session info is as below:


> sessionInfo()
R version 2.12.2 (2011-02-25)
Platform: i386-apple-darwin9.8.0/i386 (32-bit)

locale:
[1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] grid      stats     graphics  grDevices utils     datasets  methods
[8] base

other attached packages:
[1] quantreg_4.71 SparseM_0.89  reshape2_1.1  ggplot2_0.8.9 proto_0.3-9.2
[6] reshape_0.8.4 plyr_1.6

loaded via a namespace (and not attached):
[1] stringr_0.5


When I tried to load package ggplot, I was asked to also load some of the
other packages, for example "plyr". Thanks.
    Hannah

2012/6/30 Peter Ehlers <ehlers@ucalgary.ca>

> On 2012-06-30 07:04, John Kane wrote:
>
>>
>>    Hi Hannah,
>>    I have run both the original code and the code copied from the email
>> and
>>    both seem to work just fine.
>>    I don't know why you are getting that error message.   Do you have both
>>    ggplot2 and reshape2 loaded?  Still that should not give you the error
>>    message you are getting. In fact given the data I supplied, I just
>> don't
>>    understand what it is trying to say.
>>    I cannot even find a function [1]rq.fit.br.
>>
> [...]
>
> This function is in the quantreg *package*. So Hannah isn't
> telling us the whole story.
>
> Peter Ehlers
>
>

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