SaveAt

SaveAt sets what a solve saves and when, passed as saveat= on ds.pdesolve. See solutions and output.

diff_soup.SaveAt dataclass

Determines which times and quantities a solve saves.

Pass it as saveat= to pdesolve. With nothing requested the solve saves the final state only. Buffers keep a fixed size, so unfilled rows read NaN.

Parameters:

Name	Type	Description	Default
t0	bool	If True, save at the start of the interval.	False
t1	bool	If True, save at the end of the interval.	False
ts	Optional[Array]	Times inside the interval, sorted and deduplicated before the solve, and not combined with steps.	None
steps	bool | int	True saves every accepted step and an integer k every k-th, into a buffer sized from max_steps.	False
dense	bool	If True, record the interpolant for Solution.evaluate.	False
fn	Optional[Callable[..., Any]]	Not supported, and must stay None.	None
subs	Any	Not supported, and must stay None.	None
solver_state	bool	Not supported, and must stay False.	False
controller_state	bool	Not supported, and must stay False.	False
made_jump	bool	Not supported, and must stay False.	False
output	Optional[DenseOutputPolicy]	A DenseOutputPolicy for the algebraic rows of interpolated samples.	None
ordered	bool	If True, use ts as given, strictly increasing and possibly traced, without t0, t1, or steps.	False
outputs	Optional[Sequence[str]]	Names to store in place of the state, each a declared observation, a declared field, "state", or "lambdas".	None

diff_soup.timestepping.SubSaveAt dataclass

A Diffrax-style save request for one output, which no solver accepts.

SaveAt(subs=...) raises ConfigurationError. Name several stored quantities with SaveAt(outputs=...) instead.

diff_soup.DenseOutputPolicy dataclass

How the algebraic rows of interpolated samples are computed.

Pass it as SaveAt(output=...) or Event(state_policy=...).

Parameters:

Name	Type	Description	Default
mode	str	"fast" interpolates every row, and "projected" projects each sample's algebraic rows onto the constraints.	'fast'