[R] ggplot: adding layer using different data, groups and also controlling appearance

[hadley wickham]

Hi Juliet,

Can you please provide a reproducible example of the problem?

Thanks,

Hadley

On Wed, Dec 31, 2008 at 10:14 AM, Juliet Hannah <juliet.hannah at gmail.com> wrote:
> This example works now, but does the legend need to be updated
> manually? After we specify the color change, it does not appear in the
> legend. Thanks!
>
> On Wed, Sep 24, 2008 at 8:03 PM, hadley wickham <h.wickham at gmail.com> wrote:
>> On Wed, Sep 24, 2008 at 7:57 PM,  <rmailbox at justemail.net> wrote:
>>>
>>>
>>> I have a more complicated function I am trying to write, but I run in to a problem when I want to
>>> add something to the plot from more than one data set while simultaneously controlling the
>>> appearance of the additional layer.
>>>
>>> # Toy data:
>>>
>>> foo <- data.frame ( x = 1:4, y = 4:1 , membership = c( "A", "A", "B", "B" ) )
>>> bar <- data.frame ( x = 1:4 + 1 , y = 4:1 + 1, membership = rep ( "C", 4 ) )
>>>
>>> # This works, and produces a sensible (unified!) legend:
>>>
>>> foo.gg <- ggplot ( mapping =  aes ( x = x, y = y , colour = membership ) )
>>> foo.gg <- foo.gg + geom_point(data = foo)
>>> foobar.gg <- foo.gg + geom_point ( data = bar ) # works fine, creates a unified scale showing "membership"
>>> foobar.gg
>>>
>>> # This does not work:
>>> booboo.gg <- foo.gg + geom_point ( data = bar, colour = "black" )  # so far, so good, but...
>>> booboo.gg # it will not let me over-ride the colour specifications when it actually tries to construct the graph
>>>
>>> The error message is:
>>> "Error in `[.data.frame`(df, , var) : undefined columns selected"
>>>
>>> System Information:
>>> R version 2.7.2 (2008-08-25)
>>> i386-pc-mingw32
>>> ggplot2_0.6
>>>
>>> My goal is to be able to add the additional layer and control its appearance separately from the appearance of
>>> the first layer. Possible?
>>
>> This is a bug that caused by an interaction with a bug fix in R 2.7.2.
>>  Its fixed in the development version, and I'm working hard to get a
>> new release out as soon as possible.
>>
>> Hadley
>>
>> --
>> http://had.co.nz/
>>
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>> and provide commented, minimal, self-contained, reproducible code.
>>
>



-- 
http://had.co.nz/