ggplot2 Xlim

From: hadley wickham <h.wickham at gmail.com>
Subject: Re: [R] ggplot2 Xlim
To: mazatlanmexico at yahoo.com
Cc: r-help at r-project.org, "Wayne F" <wdf61 at mac.com>
Date: Friday, December 26, 2008, 3:31 PM
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
...

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