[R] ggplot2 shifting bars to only overlap in groups

[John Kane]

I am gettting the error"
Error in rep_len(rep.int(seq_len(n), rep.int(k, n)), length) : 
  object 'N' not found

Also your image did not come through.  Try sending it as a pdf file.

when I try to create 
df<- data.frame(gender=gl(2,1,N, c("male","female")),
          direction=gl(2,2,N, c("up","down")),
          condition=gl(4,4,N, c("c1","c2","c3","c4")),
          location=gl(2,16,N, c("east","west")),
          t=rnorm(N, 1, 0.5),
          ci=abs(rnorm(N, 0, 0.2)))

John Kane
Kingston ON Canada


> -----Original Message-----
> From: hyiltiz at gmail.com
> Sent: Thu, 12 Feb 2015 22:08:36 +0800
> To: r-help at r-project.org
> Subject: [R] ggplot2 shifting bars to only overlap in groups
> 
> Hi all,
> 
> I have four factors for a continuous time variable along with its
> confidence interval. I would like to produce a publication quality error
> bar chart that is clear to understand. For now, I used colors, x axis
> position, facets and alpha level to distinguish them.
> 
> I would like to overlap each pairs of bars with the same color a bit as a
> group, but not overlap each and every bars with each other.
> 
> Here is a minimal example:
> 
> N = 32
> df<- data.frame(gender=gl(2,1,N, c("male","female")),
>           direction=gl(2,2,N, c("up","down")),
>           condition=gl(4,4,N, c("c1","c2","c3","c4")),
>           location=gl(2,16,N, c("east","west")),
>           t=rnorm(N, 1, 0.5),
>           ci=abs(rnorm(N, 0, 0.2)))
> pp <-
>   ggplot(df, aes(x=gender, y=t, fill=condition, alpha=direction)) +
>   facet_grid(location~.) +
>   geom_bar(position=position_dodge(.9), stat="identity", color="black") +
>   geom_errorbar(aes(ymin=t-ci, ymax=t+ci),
>                 width=.2,                    # Width of the error bars
>                 position=position_dodge(.9)) +
>   scale_alpha_discrete(range= c(0.4, 1))
> pp
> 
> 
> 
> In the attachment, I have added the output figure, while manually editing
> the SVG file to make the lower-left group of bars to make them as I
> wanted.
> (The spacing in between each pair is not necessarily required.)
> 
> 
> ​Best
> ，
> ========================
> He who is worthy to receive his days and nights is worthy to receive* all
> else* from you (and me).
>                                                  The Prophet, Gibran
> Kahlil
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> and provide commented, minimal, self-contained, reproducible code.

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