grouped vertical bar chart with trellis graphics

["David Cairns" <cairns@tamu.edu>]

    I am using Splus 7.0 on Windows XP and I need to create a grouped vertical bar chart.  Is there a way to do this using trellis? 

 

    I have a data frame that contains one factor (h) that has 2 levels.  For each value of h there is a set of values x (1:15) and there are 4 observations (y1:y4) for each value of x.  The data frame has columns h, x, y1, y2, y3, and y4.  I would like a bar plot that has 4 bars for each value of x, displayed in two panels (one for each value of h).

 

    Thanks for any help you might be able to provide.

 

David M. Cairns

Associate Professor

Department of Geography

3147 TAMU

Texas A&M University

College Station, TX 77843

 

Phone: (979) 845-2783

Fax: (979) 862-4487