Changelog • midi

midi (development version)

CRAN release: 2026-07-05

The unit system has changed from SI units (m, s, T/m) to μm, ms, and μT/μm throughout all compartment classes and helper functions.
CylinderBundleCompartment$new() no longer accepts axis, radius, diffusivity, n_cylinders, axis_concentration, radius_sd, radial_model, and seed arguments. It now accepts cylinder_compartments, a list of CylinderCompartment objects (typically produced by rcylinders()), and infers axis, radius, and diffusivity statistics by fitting Watson and Gamma distributions to the provided compartments.
CylinderCompartment$new() no longer accepts radius, diffusivity, and radial_model arguments. It now accepts a restricted_compartment argument, an instance of a circularly-shaped compartment class (e.g., VanGelderenCompartment$new()).

New bvalue() function to compute the b-value from gradient pulse parameters.
New FreeCompartment class to model free unconstrained diffusion.
New GammaDistribution class providing fit(), random(), get_mean(), get_variance(), get_shape(), and get_scale() methods.
New rcylinders() function to sample a list of CylinderCompartment objects from Watson (axis) and Gamma (radius, diffusivity) distributions.
New SphereCompartment class to model restricted diffusion in a sphere.
New WatsonDistribution class providing fit(), random(), get_axis(), and get_concentration() methods.
All compartment classes now expose get_parameters() and get_parameter_names() methods inherited from the new BaseCompartment base class.

CRAN release: 2024-04-03