simulate, calculate, or get existing log probabilities for the current values in a NIMBLE model
simNodes(model, nodes)calcNodes(model, nodes)
getLogProbNodes(model, nodes)
A NIMBLE model
A set of nodes. If none are provided, default is all model$getNodeNames()
Perry de Valpine
These are basic nimbleFunctions that take a model and set of nodes and return a function that will call calculate, simulate, or getLogProb on those nodes. Each is equivalent to a direct call from R, but in nimbleFunction form they can be be compiled. For example, myCalc <- calcNodes(model, nodes); ans <- myCalc() is equivalent to ans <- model$calculate(nodes), but one can also do CmyCalc <- compileNimble(myCalc) to get a faster version. Note that this will often be much faster than using `calculate` from R with a compiled model, such as compiled_model$calculate(nodes) because of overhead in running `calculate` from R.
In nimbleFunctions, one would generally use model$calculate(nodes) in the run-time code (and similarly for `simulate` and `getLogProb`).