Initialize the User-defined Aggregate in ECPG

Hi all,

I'm using the embedded SQL in C to create the User-Defined Aggregate(UDA).
The command is :
CREATE AGGREGATE aggname( sfunc=kmeans,
stype=double precision[],
finalfunc=kmeansfinal,
INITCOND='{1,2,3}');

Since I need to do the aggregation in multiple rounds. I need to initialize
the INITCOND using the execution result of last execution （aggregation.）
Any one can tell me how can I initialize the INITCOND using host variables
instead of hard code the INITCOND?

The reason why I need to do this is that I am implementing the K-Means
Clustering
algorithm which is a recursive algorithm. Now my idea of doing this is I
get the result from
one round aggregation, DROP the AGGREGATE, and CREATE a new AGGREGATE
using the result of last round.

Jay