[R] ggplot2 Xlim

[hadley wickham]

Hi Felipe,

It sounds like ForkLength is a factor - what deos str(FL) tell you?
You might also need geom_bar(..., stat = "identity") since your data
are pretabulated.

Hadley

On Fri, Dec 26, 2008 at 2:44 PM, Felipe Carrillo
<mazatlanmexico at yahoo.com> wrote:
> Wayne:
> What's crowded are my x axis labels. The bars look fine on my graph but the labels are being displayed from 29 to 170 one by one. I need something like a seq(29,170 by:10) or something like that. I don't want to treat my FL as factor because I don't want a bar per each FL value, I only want to count the number of FL at any given FL size. Thanks
>
>
> --- On Thu, 12/25/08, Wayne F <wdf61 at mac.com> wrote:
>
>> From: Wayne F <wdf61 at mac.com>
>> Subject: Re: [R] ggplot2 Xlim
>> To: r-help at r-project.org
>> Date: Thursday, December 25, 2008, 2:43 PM
>> I'm just a ggplot2 beginner, but...
>>
>> It seems to me that you're mixing continuous and factor
>> variables/concepts.
>> It looks to me as if ForkLength and Number are continuous
>> values. But you'll
>> need to convert ForkLength into a factor before using
>> geom="bar". I do that
>> and the graph "works" but the bars are extremely
>> busy, which I assume is
>> what you mean by "crowded".
>>
>> As I try several different things, I'm seeing error
>> messages. Are you not
>> seeing error messages?
>>
>> Is the bottom line that you simply want to display some
>> continuous data in a
>> histogram-ish style, and you don't like the default
>> "binning" of Number for
>> each of many ForkLengths?
>>
>> If you simply use geom="line", things look clear
>> and simple, no need to bin
>> or simplify or...
>>
>> If you do end up using geom="bar", I believe the
>> mistake you're making --
>> and I see an error message when I try -- is that you are
>> using
>> scale_x_continuous whereas the X axis is discrete, so you
>> should be using
>> scale_x_discrete. But then it will take some R magic to
>> combine your "bins"
>> into wider bins so you get a "less crowded" look.
>>
>> Or perhaps I'm misunderstanding?
>>
>>    Wayne
>>
>>
>> Felipe Carrillo wrote:
>> >
>> > Hi: I need some help.
>> >  I am ploting a bar graph but I can't adjust my x
>> axis scale
>> >  I use this code:
>> >       i <-
>> qplot(ForkLength,Number,data=FL,geom="bar")
>> >     i +
>> geom_bar(colour="blue",fill="grey65") #
>> too crowded
>> >
>> >      FL_dat <-
>> ggplot(FL,aes(x=ForkLength,y=Number)) +
>> >
>> geom_bar(colour="green",fill="grey65")
>> >     FL_dat + scale_x_continuous(limits=c(20,170)) #
>> Can't see anything
>> >
>> > FL  Number
>> > 29  22.9
>> > 30  63.4
>> > 31  199.3
>> > 32  629.6
>> > 33  2250.1
>> > ...
>> >
>>
>> --
>> View this message in context:
>> http://www.nabble.com/ggplot2-Xlim-tp21161660p21170453.html
>> Sent from the R help mailing list archive at Nabble.com.
>>
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>
> ______________________________________________
> R-help at r-project.org mailing list
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>



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