R help - Feb 2016 - 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

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
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> 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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