Run an expression under a chosen symplectic integrator

Evaluate expr with the integrator set to name, then restore whatever was selected before – on an error as well as on success. The integrator selection is process-global, so a bare tulpa_integrator() call leaves every later fit in the session on the new scheme, and an error between setting and restoring leaves it there permanently.

Usage

with_tulpa_integrator(name, expr, mts_substeps = 4L)

Arguments

name

Integrator name, as for tulpa_integrator().

expr

Expression to evaluate. Evaluated in the caller's environment.

mts_substeps

Inner prior-force substeps for "mts" (default 4).

Value

The value of expr.

See also

tulpa_integrator()

Examples

with_tulpa_integrator("yoshida4", tulpa_integrator())
tulpa_integrator()   # unchanged