R help - Jul 2010 - how to update a bugs-model from inside R using R2WinBUGS

Hello there,

is there a way to update a model, which was called by "bugs()"? For 
instance starting with few iterations and then updating more and more, 
as is possible inside the WinBUGS-window. If set "debug=TRUE", then
the
window remains open and updating is possible, but it is no longer 
written into the R-object. Is it generally impossible?

Thanks,
Frederic

Fr?d?ric Holzwarth <frederic.holzwarth <at> uni-leipzig.de> writes:
> 
> Hello there,
> 
> is there a way to update a model, which was called by "bugs()"?
For
> instance starting with few iterations and then updating more and more, 
> as is possible inside the WinBUGS-window. If set "debug=TRUE",
then the
> window remains open and updating is possible, but it is no longer 
> written into the R-object. Is it generally impossible?
> 
> Thanks,
> Frederic
> 
> 

  As far as I know (not having checked carefully), it's impossible --
this is one of the advantages of JAGS/Rjags/R2jags.

  Ben Bolker

The script command "coda" is not necessary, unless you want to read in
in
coda-format output. Necessary are the other commands: "history & save
(odc)". "save (txt)" lets you read the on-screen output of
winbugs later as
a text-file.

Another way is also to take the saved last values of the chains and use them
as new starting values. This is fine but it takes a bit longer because the
model has to be compiled again each time.
The R-code would be like this:

bugs_out1 <- bugs(data=data, inits=inits, parms=parms, model=...
lv <- bugs_out$last.values
#and
bugs_out2 <- bugs(data=data, inits=lv, parms=parms, model=...

Frederic

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