CEP Pattern Matching for Straight line graph

Hi,
I have a scenario where weight is directly proportional to depth, which produces a linear straight line.
CEP will get data for weight and depth, CQL has to be write to raise an event when there is a change in straight line graph.
How to write CQL query and use match pattern for this.
Thanks,
Sri

So lets say you have an input Channel with event Type E(weight, depth)
Idea is to compute the slope - weight/depth and report the first and those subsequent events whose w/d is different from that of the previous event
Here is the query
SELECT
          T.weight,
          T.depth
FROM
          E MATCH_RECOGNIZE (
                MEASURES
                         A.depth as depth,
                         A.weight as weight
                PATTERN (A)
                DEFINE
                         A AS ( (PREV(A.weight) is null) OR (PREV(A.weight)/PREV(A.depth) != A.weight/A.depth) )
          ) as TEdited by: Anand Srinivasan on Mar 8, 2012 7:56 AM

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