geom_dotplot is not working with qplot.

[rasmusab]

This produces a nice dot plot:

ggplot(mtcars, aes(x = mpg)) + geom_dotplot()
## stat_bindot: binwidth defaulted to range/30. Use 'binwidth = x' to adjust this.

Using qplot I get the following error and no plot:

qplot(mpg, data=mtcars, geom="dotplot")
## stat_bindot: binwidth defaulted to range/30. Use 'binwidth = x' to adjust this.
## Error in if (params$stackdir == "up") { : argument is of length zero

If it's not supposed to work then I'm sorry for wasting your time, but usually it is possible to transition between ggplot and qplot in this way in qqplot2...

sessionInfo()
## R version 3.0.1 (2013-05-16)
## Platform: i686-pc-linux-gnu (32-bit)

## locale:
##  [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C               LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
##  [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8    LC_PAPER=C                 LC_NAME=C                 
##  [9] LC_ADDRESS=C               LC_TELEPHONE=C             LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

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

## other attached packages:
## [1] boot_1.3-9      reshape_0.8.4   plyr_1.8        stringr_0.6.2   lattice_0.20-15 ggplot2_0.9.3.1

## loaded via a namespace (and not attached):
## [1] colorspace_1.2-2   dichromat_2.0-0    digest_0.6.3       grid_3.0.1         gtable_0.1.2      
##  [6] labeling_0.1       MASS_7.3-26        munsell_0.4        proto_0.3-10       RColorBrewer_1.0-5
## [11] reshape2_1.2.2     scales_0.2.3       tools_3.0.1 

[hadley]

This sounds like a great feature/horrible bug, but unfortunately we don't currently have the development bandwidth to support it/fix it. If you'd like to submit a pull request that implements this feature/fixes this bug, please follow the instructions in the development vignette.