IntegrationEvent

class IntegrationEvent(event_finder: Callable[[float, list], float], find_increasing: bool, find_decreasing: bool, is_terminal: bool = False)

Bases: object

Defines an event based off time, state, or both.

After each accepted IAS15 step, with \(g_{k-1}\) and \(g_k\) the values of event_finder at the previous and the current step, the event triggers on

\[g_{k-1} < 0 \le g_k \quad \text{(increasing)}, \qquad g_{k-1} > 0 \ge g_k \quad \text{(decreasing)},\]

as selected by find_increasing and find_decreasing. The crossing time is not refined inside the step, so it is resolved to the step size.

Parameters:

event_finderCallable[[float, list], float]

Event function \(g(t, \mathbf{y})\); the event is a zero crossing.

find_increasingbool

Flag to detect the event when it crosses from negative to positive.

find_decreasingbool

Flag to detect the even when it crosses from positive to negative.

is_terminalbool, optional

Flag to decide if integration should stop when the event is detected. Defaults to False.