[R] ggplot stacked bar chart help

[Ryan Garner]

I'm trying to create a stacked bar chart with x=month, y=volume, and
factor=type.

volume   type   month
100        A       SEP09
200        A       OCT09
300        A       DEC09
400        B       SEP09
500        B       OCT09
600        B       DEC09
700        C       SEP09
800        C       OCT09
900        C       DEC09

Following Hadley's examples, I get 3 bars with SEP09: 3-A, 3-B, 3-C, OCT09:
3-A, 3-B, 3-C, and NOV09: 3-A, 3-B, 3-C. I need SEP09: 100-A, 400-B, 700-C,
OCT09: 200-A, 500-B, 800-C, and NOV09: 300-A, 600-B, 900-C.
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