Hello,

you've probably already figured it out, but the error is because you are
telling ggplot to use an x variable which doesn't exist:

ggplot(data, aes(x=year_bis,y=area)) + geom_bar(stat="identity"

year_bis is not a column in the data frame you show us, if you change it to:

ggplot(data, aes(x=year,y=area)) + geom_bar(stat="identity")

it should work.

Date: Mon, 23 Sep 2013 09:36:09 +0200
> From: Dylann Kersusan <kersusan.dylann@gmail.com>
> To: r-sig-ecology@r-project.org
> Subject: [R-sig-eco] R graphics cookbook
> Message-ID:
>         <CAEcqiB9vGNNO=s_xTer=xsWaqAsw=
> cTBHqgsXd2eSMEVZaJqyA@mail.gmail.com>
> Content-Type: text/plain
>
> Hi everyone,
>
> I am trying to apply the following lines of coding (they are from the R
> Graphics Cookbook, Chapter 3: Bar Graphs):
>
> ggplot(data, aes(x=year_bis,y=area)) + geom_bar(stat="identity")
>
> I do have a data.frame as follow:
>
>   id year start_day loc    area
> 1  1 2010       155  20  3.4388
> 2  1 2010       169  18 11.6576
> 3  1 2010       183  17 15.5893
> 4  1 2010        71  41 22.0356
> 5  1 2010       127  42 27.2602
> 6  1 2010        99  37 52.2779
>
>
> > str(data)'data.frame':        221 obs. of  5 variables:
>  $ id       : int  1 1 1 1 1 1 1 1 1 1 ...
>  $ year     : int  2010 2010 2010 2010 2010 2010 2008 2010 2009 2010 ...
>  $ start_day: int  155 169 183 71 127 99 337 1 337 113 ...
>  $ loc      : int  20 18 17 41 42 37 10 36 41 40 ...
>  $ area     : num  3.44 11.66 15.59 22.04 27.26 ...
>
>
> I called both packages "gcookbook" and "ggplot2" (among others). That's a
> rather easy line of coding, but for some reasons I do have the following
> warning message:
>
> Error in as.environment(x) :
>
> incorrect
>
> objet for 'as.environment'
>
>
> Do you have any clue why?
> Thanks a lot.
>
> Greetings.
> --
> Dylann Kersusan
> Master Biodiversity and Conservation
> Zoology dept. Stockholm University
> --
> Grimsö Wildlife Research Center
> Ecology dept. SLU
> Riddarhyttan-Sweden
>
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> End of R-sig-ecology Digest, Vol 66, Issue 11
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>



-- 
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___________________________________________________________________________

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