[R] ggplot2 Xlim
wdf61 at mac.com
Thu Dec 25 23:43:45 CET 2008
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?
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)) +
> 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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