[R] ggplot: geom_bar not respecting factor order when stacking

[PIKAL Petr]

Hi

So if the legend is in correct order you need to reorder the sequence of bars from top/bottom to bottom/top here is one solution.

ggplot(temp, aes(x=trait, y = value)) + geom_bar(stat = "identity",
aes(fill=varlevel, order= -as.numeric(varlevel)))

Cheers
Petr


> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of
> Alexander Shenkin
> Sent: Thursday, February 04, 2016 11:24 AM
> To: r-help at r-project.org
> Subject: [R] ggplot: geom_bar not respecting factor order when stacking
>
> Hi all,
>
> ggplot2 (v2.0.0) does not seem to respect factor order when stacking
> bars in geom_bar().
>
> ##################
>  > dput(temp)
> structure(list(phylo_sig = c(0.148740270638472, 0.148740270638472,
> 0.148740270638472, 0.148740270638472, 0.148740270638472), trait =
> c("p_corrected_percent",
> "p_corrected_percent", "p_corrected_percent", "p_corrected_percent",
> "p_corrected_percent"), value = c(0.031015586683513,
> 0.0553330412480036,
> 0.73674222087599, 0.114517508485538, 0.0623916427069555), varlevel =
> structure(c(3L,
> 2L, 4L, 5L, 1L), .Label = c("species", "genus", "family", "plot_code",
> "Residual"), class = "factor")), .Names = c("phylo_sig", "trait",
> "value", "varlevel"), row.names = c(28L, 62L, 96L, 130L, 164L
> ), class = "data.frame")
>  > str(temp)
> 'data.frame':    5 obs. of  4 variables:
>   $ phylo_sig: num  0.149 0.149 0.149 0.149 0.149
>   $ trait    : chr  "p_corrected_percent" "p_corrected_percent"
> "p_corrected_percent" "p_corrected_percent" ...
>   $ value    : num  0.031 0.0553 0.7367 0.1145 0.0624
>   $ varlevel : Factor w/ 5 levels "species","genus",..: 3 2 4 5 1
>  > ggplot(temp, aes(x=trait, y = value)) + geom_bar(stat = "identity",
> aes(fill=varlevel, order = varlevel))
> ##################
>
> The code above results in the correct legend order, but incorrect order
> of stacking (https://i.imgur.com/lgAxTFh.png).  I have to change the
> order of the actual dataframe rows in order to coerce the stacking to
> work:
>
> ##################
>  > temp = temp[c(5,2,1,3,4),]
>  > ggplot(temp, aes(x=trait, y = value)) + geom_bar(stat = "identity",
> aes(fill=varlevel, order = varlevel))
> ##################
>
> This results in correct stacking (https://i.imgur.com/baww43x.png).
> Any
> assistance in getting ggplot to pay attention to the factor ordering
> when stacking bars would be much appreciated!
>
> Thanks,
> Allie
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-
> guide.html
> and provide commented, minimal, self-contained, reproducible code.

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