Talk:Event handling

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REINIT and PRE

One basic implementation of boundary events would be to allow a REINIT statement in addition to the USE statement to exist inside WHEN..CASE. REINIT statments would be associated with a particular CASE, and whenever a CASE change occurred, it would trigger an ICP to be created and solved.

PRE could then be added to the language. PRE inside a 'normal' relation would trigger an error. PRE inside a REINIT statement would result in a callback to the solver, which would have to keep a copy of variable values before the current boundary.

REINIT x TO -0.9*pre(x);

This statement would set the new value of 'x' and perhaps remove 'x' from the initial value problem. The derivative of x would still need to be solved for, using the dynamic equations in the problem.

Jpye 10:55, 11 February 2012 (EST)