vice.milkyway.RIa
=================

Type : ``<function>`` or ``str`` [case-insensitive]

Default: "plaw"

The delay-time distribution (DTD) for type Ia supernovae to adopt. If
type ``str``, VICE will use a built-in DTD:

- "exp" : :math:`R_\text{Ia} \sim e^{-t}`
- "plaw" : :math:`R_\text{Ia} \sim t^{-1.1}`

When using the exponential DTD, the e-folding timescale is set by the
attribute ``tau_ia``.

Functions must accept time in Gyr as the only parameter and return the
rate at that delay-time.

.. tip::

	A custom DTD does not need to be normalized by the user. VICE will
	take care of this automatically.

.. note::

	Saving functional attribute with VICE outputs requires the
	package dill_, an extension to ``pickle`` in the Python_ standard
	library. It is recommended that VICE users install dill_
	>= 0.2.0.

	.. _dill: https://pypi.org/project/dill/
	.. _Python: https://docs.python.org/library/

Example Code
------------
>>> import math as m
>>> import vice
>>> mw = vice.milkway(name = "example")
>>> mw.RIa = "exp"
>>> mw.RIa
"exp"
>>> def f(t):
	if t < 0.2:
		return 1
	else:
		return m.exp(-(t - 0.2) / 1.4)
>>> mw.RIa = f