I frequently have rules in my fuzzy models like:
if costs[t-N] are much greater than income[t-(n+1)]
then margins are reduced;
(where "margins" is a time series variable and is assumed to be "margins[t]").
Few, if any, control fuzzy shells can encode this kind of rule. I also have
rules like,
for each project where cost are high and duration is long;
if project.revisions are large
and diff(&today,project.duedate) is a LargeNegative
then risk is very high;
where the rule can incorporate database or spread sheet access. Again, the
fuzzy control shells usuallyhave no way to access corporate data.
Thus, re-entrant and recursive rules are just one problem with the current
family of fuzzy shells.
Earl
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