I'm hoping to use R for spatial analysis.  In working through examples in 
Chapt. 4 of Applied Spatial Data Analysis with R I've come across the following 
error in trying to plot lines with the meuse data set.  The text is verbatim 
from the book.

> m.sl <- SpatialLines(list(Lines(list(Line(cc)))))
Error in Lines(list(Line(cc))) : Single ID required

What does "Single ID required" mean?

Thanks.

Mark

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