pomp version 1.5 is now available on CRAN.
User-visible changes
- A better interface for specifying a model’s deterministic skeleton is provided.
In the
pomp
function, specifyskeleton=map(f,delta.t)
for a discrete-time skeleton (a map) andskeleton=vectorfield(f)
for a continuous-time skeleton (a vectorfield). The old argumentsskeleton.type
andskelmap.delta.t
are deprecated and will be removed in a future release, at which point the new interface will be mandatory. - The
method="mif2"
option tomif
has been removed. Usemif2
instead. - The
particles
method (rarely if ever used), has been removed to streamline themif
codes. mif2
no longer computes filter means of parameters or state variables.- The minimum version of \R supported is now 3.1.2.
New features
- The new argument
show
ofpompExamples
allows one to display the example code instead of executing it. init.state
now has the optional argumentnsim
. Using this, one can request multiple initial state vectors per parameter vector.
Documentation improvements
- The
pfilter
help page has been improved. Specifically, the discussion of filtering failures is more explicit and easier to find.
Bug fixes
- A bug associated with the
rw.sd
argument tomif2
on Windows platforms has been fixed.
Under the hood
pfilter
now uses less memory when it is asked to run at a single point in parameter space.- The particle filtering algorithms underlying
mif
andmif2
have now been completely separated from those underlyingpfilter
, a considerable simplification of the codes.
Please see the package NEWS for more details.