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[S] How do you specify a 0 baseline in barchart?

To: "S-news (E-mail)" <s-news@wubios.wustl.edu>
Subject: [S] How do you specify a 0 baseline in barchart?
From: "Steven P. Millard" <steven.p.millard@cwix.com>
Date: Sat, 23 Jan 1999 09:11:03 -0800
Cc: "S-PLUS Technical Support (E-mail)" <support@statsci.com>
Organization: PSI
Reply-to: "smillard@probstatinfo.com" <smillard@probstatinfo.com>
Sender: owner-s-news@wubios.wustl.edu
Hello,

I'm using S-PLUS 4.5, Release 2.

I'm comparing dot plots and bar charts for some data.  I'd like to be 
able to specify a 0 baseline in the call to barchart(), but don't know 
how.  Using the xlim argument does not work of course, since this only 
specifies the approximate x-axis minimum and maximum.  I thought about 
playing around with setting the usr graphics parameter, but I'm pretty 
sure trellis functions ignore that.

Here is an example:

     dum.df <- data.frame(Mileage = fuel.frame$Mileage,
          Name = row.names(fuel.frame), Type = fuel.frame$Type)

     barchart(Name ~ Mileage, data = dum.df, subset = Type == "Van")


Note that if you use the menu version of bar chart, the bar chart 
automatically uses a 0 baseline.  Also note, however, that there is a 
bug in the menu version ("Subset Rows with" box) because the plot shows 
labels for all car types, not just Vans.

Thanks for your time!


Sincerely,

--Steve M.

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