| [birt-news] problems with stacked bar chart |
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I have the following data set, which lists the date, the
period of time, and the number of users that were inactive within that period
of time on that date. 01/01/2007 0 15 01/01/2007 7 10 01/01/2007 30 0 15/06/2007 0 21 15/06/2007 7 4 15/06/2007 30 5 I would like to build a stacked bar chart, which has one bar
per distinct date (first column) and one stack per distinct period of time
(second column). Each stack’s height will be set to the number of users (third
column). So, for the data set above I would have two bars: one –
for 01/01/2007 and another one for 15/06/2007. The first bar will have three
stacks on heights 15, 7 and 30. The second bar will also have three stacks with
heights 21, 4 and 5. I can map X-series to the first column, but I don’t
know how to map each Y series to the corresponding period of time. In other
words, I want one Y-series to be mapped to rows with interval=0, another series
– to rows with interval = 7 and the last series – to rows with
interval=30. How should I define expressions for those series in _expression_
Builder? Thanks. Alec |