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ggplot2 Xlim

6 messages · Felipe Carrillo, stephen sefick, Wayne F +1 more

Felipe Carrillo
# 
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
34	7452.5
35	19352.9
36	17655.5
37	13020.6
38	5856.0
39	2039.4
40	1261.2
41	780.2
42	826.6
43	739.0
44	608.2
45	694.3
46	599.5
47	690.4
48	762.9
49	594.6
50	771.7
51	695.3
52	784.5
53	780.1
54	823.6
55	883.2
56	747.6
57	834.4
58	716.7
59	632.8
60	670.4
61	511.0
62	577.4
63	538.0
64	452.3
65	451.7
66	355.7
67	294.1
68	278.8
69	165.5
70	208.7
71	161.6
72	159.9
73	100.9
74	84.4
75	110.3
76	69.3
77	60.7
78	63.2
79	28.8
80	46.1
81	34.6
82	37.1
83	35.5
84	35.7
85	24.3
86	17.5
87	24.9
88	21.5
89	17.4
90	14.0
91	7.8
92	10.1
93	6.8
94	2.9
95	4.0
96	7.3
97	4.6
98	4.0
99	1.7
100	5.0
101	11.3
102	3.0
103	5.2
104	9.4
105	6.4
106	1.0
107	8.5
108	8.6
109	10.1
110	9.0
111	11.7
112	16.0
113	3.1
114	7.6
115	3.9
116	7.0
117	6.9
118	8.1
119	2.0
121	3.7
122	1.9
123	4.0
124	6.3
126	2.0
127	2.0
128	1.0
129	2.0
132	2.0
134	7.3
135	1.0
136	1.0
139	1.0
142	1.0
145	1.0
152	2.0
161	2.5
172	1.0


Felipe D. Carrillo  
Supervisory Fishery Biologist  
Department of the Interior  
US Fish & Wildlife Service  
California, USA
stephen sefick
# 
would you make this reproducible, please.  Think cut and paste out of
email into R.

?dput

my guess would be the breaks argument

On Wed, Dec 24, 2008 at 12:31 PM, Felipe Carrillo
<mazatlanmexico at yahoo.com> wrote:

  
    

      
      
    

  


  


      

    

    
1 day later

    

      
      

        


  

        

      Wayne F
    

    

      
      #
    

  


  

      
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:

            

      
      
      
    

        

  
    

      
      
    

  


  


      

    

    

      
      

        


  

        

      Felipe Carrillo
    

    

      
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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:

        

            

      
      
      
    

        

      
      
    

  
  


  


      

    

    

      
      

        


  

        

      Hadley Wickham
    

    

      
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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:

            

      
      
      
    

        

      
      
    

            

      
      
      
    

        

      
      
    

        

  
    

      
      
    

  


  


      

    

    

      
      

        


  

        

      Felipe Carrillo
    

    

      
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Thanks Hadley: I had already gone to your website and stat="identity" is what I needed.

        
--- On Fri, 12/26/08, hadley wickham <h.wickham at gmail.com> wrote: