R help - Apr 2013 - Question about removing missing data rows in the qplot

Hi,



I've a question about the qplot. I use facets=Antibiotics~Gram.Stainng to
draw 6 plots in a panel. Now the problem is within each 'Gram.Staining'
categorical level there are some antibiotics does not have value (in my case is
log(MIU)). Because some antibiotics are positive gram staining and some are
negative.



So my question is how to remove these missing value rows in the plot?



My code is

qplot(Bacteria,log(MIC),data=project2,facets=Gram.Staining~Antibiotics,color=Bacteria,geom='bar',stat='identity',fill=Bacteria,na.rm=TRUE)+coord_flip()



I also enclose my plot.



Thank you!



Wang Zhensheng





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