[libreoffice-users] Conditional hide rows in Calc?

I have a variable numbers of data elements for each day, and I'd like to
hide all but the last of each day (or export only the last-of-day values);
is there an easy way?

Example data:
row | date | reading number | value | ...
1 | 7/1/2011 | 1 | 3
2 | 7/2/2011 | 1 | 6
3 | 7/2/2011 | 2 | 7
4 | 7/2/2011 | 3 | 5
5 | 7/4/2011 | 1 | 4
6 | 7/5/2011 | 1 | 5
7 | 7/5/2011 | 2 | 6

So I'd like to extract:
1 | 7/1/2011 | 1 | 3


4 | 7/2/2011 | 3 | 5
5 | 7/4/2011 | 1 | 4

7 | 7/5/2011 | 2 | 6

Is there a way to use conditional formatting to hide a row, based on a test
of the reading number of the current row compared to the reading number of
the next row?
-- 
  Wayne

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