[R] dotchart for matrix data

[e-letter]

>Ben Bolker
>Sat, 18 Dec 2010 07:07:24 -0800
>David Winsemius <dwinsemius <at> comcast.net> writes:
>
>>
>>
>> On Dec 18, 2010, at 7:01 AM, e-letter wrote:
>>
>> > Readers,
>> >
>> > I am trying to use the function dotchart. The data is:
>> >
>> >> testdot
>> >  category values1 values2 values3 values4
>> > 1        a      10      27      56     709
>> > 2        b       4      46      47     208
>> > 3        c       5      17      18     109
>> > 4        d       6      50      49     308
>> >
>> > The following error occurs
>> >
>> >> dotchart(testdot,groups=testdot[,2])
>> > Error in dotchart(testdot, labels = testdot[, 1], groups = testdot[,
>> > 2]) :
>> >        'x' must be a numeric vector or matrix
>> >
>> > According to my understanding (clearly wrong!) of the documentation
>> > for dotchart (accessed from the manual in section 'graphics'), columns
>> > of data can be selected by 'groups' for subsequent plotting.
>>
>
>  Following up on David's response:
>
>
>d <- read.table(textConnection("category values1 values2 values3 values4
>1        a      10      27      56     709
>2        b       4      46      47     208
>3        c       5      17      18     109
>4        d       6      50      49     308"),
>                header=TRUE)
>
>## Something like this is probably as close as you can get with
>## stock 'dotchart' -- it does *not* (as far as I can tell) put
>## different points on the same line, just groups lines
>

I am trying to create a chart like this
(http://www.b-eye-network.com/images/content/Fig4_3.jpg); so this is
not possible using R?

>dotchart(as.matrix(d[,-1]),labels=as.character(d[,1]))
>dotchart(as.matrix(d[,c("values1","values2")]),labels=as.character(d[,1]))
>
>## reshaping data:
>library(reshape)
>mdot <- melt(d)
>
>## using the lattice package
>
>library(lattice)
>dotplot(value~category,groups=variable,data=mdot)
>dotplot(value~variable,groups=category,data=mdot,auto.key=TRUE,
>        scales=list(y=list(log=10)))
>
>## you could also use ggplot2 ...

> ?ggplot2

No documentation for 'ggplot2' in specified packages and libraries:
you could try 'help.search("ggplot2")'; seems I need to retrieve this
package first. Thanks for the suggestion.