generate a barplot that retains the record order of the input data frame?

[Gordon Robertson]

I'm inexperienced with ggplot, so apologize if I've missed something simple. I'm using ggplot2_0.9.3. 

I'd like to generate a bar plot from an input data frame in which rows are sorted by descending value of a column. I'd like the bar plot to retain this record order. Big bars at the top, small at the bottom. Each bar has a label (a GO term), and a label is put beside its bar. 

When I generate the plot, the bars are reordered so that the labels are in order. In the example below, the plot's bars will be reordered to put bar 3 is at the top and 1 at the bottom. I'd like the bars to be in the order they are in, in df.o. 

> df <- data.frame( labs=c(2,1,3), vals=c(1.1,3.3,2.2) )

> df

  labs vals

1    2  1.1

2    1  3.3

3    3  2.2

> df.o <- df[order(-df$vals),]

> df.o

  labs vals

2    1  3.3

3    3  2.2

1    2  1.1

> pt <- ggplot( df.o, aes(x=labs, y=vals) )

> pt + geom_bar(stat="identity", fill="white", width=0.8, colour="darkgreen") + coord_flip()

# plotted as:

#3  2.2

#2  1.1

#1  3.3 

Thanks for your help.

G

--

Gordon Robertson
Michael Smith Genome Sciences Centre

BC Cancer Agency
Vancouver BC Canada
www.bcgsc.ca

[Ista Zahn]

Hi Gordon,

Please see http://stackoverflow.com/questions/tagged/ggplot2?sort=faq&pagesize=30.
The question at the top of the list answers your question.

Best,
Ista

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