geom_histogram with facet_grid - only unique values counted?

[Freddie Partridge]

Example code:

library(ggplot2);

result <- c(133.3333, 142.8571, 130.4348, 139.5349, 136.3636, 139.5349, 139.5349, 139.5349, 

           122.449, 142.8571, 142.8571, 130.4348, 139.5349, 142.8571, 139.5349, 

           142.8571, 120, 136.3636, 139.5349, 133.3333, 136.3636, 127.6596, 

           139.5349, 139.5349, 139.5349, 136.3636, 127.6596, 139.5349, 139.5349, 

           122.449, 136.3636, 139.5349, 136.3636, 130.4348, 139.5349, 136.3636, 

           127.6596, 136.3636, 127.6596, 130.4348, 122.449, 127.6596, 136.3636, 

           142.8571, 136.3636, 136.3636, 136.3636, 127.6596);

time <- rep("10mins",48);

df<-data.frame(time, result);

ggplot(df,aes(x=result)) + 

  geom_histogram(binwidth=10);

ggplot(df,aes(x=result)) + 

  geom_histogram(binwidth=10) +

  facet_grid(~time);

ggplot(unique(df),aes(x=result)) + 

  geom_histogram(binwidth=10);

The first plot is as expected, with the highest column count >30.

In the second plot I plot this data as part of a facet_grid - the highest count is now only 4. (For simplicity here I only supply data for one facet, the problem is the same with a complete dataset) 

The plot is in fact the same as if I plot only the unique values, as in the third plot.

Is this the expected output?

Many thanks,

Freddie 

> sessionInfo()
R version 2.14.2 (2012-02-29)
Platform: x86_64-pc-mingw32/x64 (64-bit)

locale:
[1] LC_COLLATE=English_United Kingdom.1252  LC_CTYPE=English_United Kingdom.1252   
[3] LC_MONETARY=English_United Kingdom.1252 LC_NUMERIC=C                           
[5] LC_TIME=English_United Kingdom.1252    

attached base packages:
[1] grid      stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] scales_0.2.0  gridExtra_0.9 ggplot2_0.9.0

loaded via a namespace (and not attached):
 [1] colorspace_1.1-1   dichromat_1.2-4    digest_0.5.2       MASS_7.3-17        memoise_0.1       
 [6] munsell_0.3        plyr_1.7.1         proto_0.3-9.2      RColorBrewer_1.0-5 reshape2_1.2.1    
[11] stringr_0.6        tools_2.14.2  

[Freddie Partridge]

ok I think this may be due to the fixed bug https://github.com/hadley/ggplot2/issues/443

If so please ignore, will wait for 0.9.1

[Winston Chang]

You can install the development version (with the bug fix) now:

https://github.com/wch/ggplot2/wiki/Installing-the-development-version-of-ggplot2

On Mon, Apr 23, 2012 at 12:25 PM, Freddie Partridge <fpart...@gmail.com> wrote:

ok I think this may be due to the fixed bug https://github.com/hadley/ggplot2/issues/443

If so please ignore, will wait for 0.9.1

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