ggplot2 Xlim

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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