rscala (version 3.2.25)

scalaPull: Push and Pull Objects Between R and Scala

Description

The push function serializes an R object to Scala and the push function does the opposite. A couple of built push and pull methods are provided, namely "generic" and "list". The "generic" method serializes an arbitrary R object to an instance of RObject in Scala. Since the RObject merely contains an array of bytes, the RObject is really only useful as storage for later unserialization. The "generic" method has an optional as.is argument which is either TRUE to cause the list to serialized as a single object or FALSE to cause each element of the list to the serialized individually. More methods may be added using the functions scalaPushRegister and scalaPullRegister.

Usage

scalaPull(reference, method, ...)
scalaPush(x, method = "generic", bridge = scalaFindBridge(), ...)

Arguments

reference

An rscala reference.

method

A string giving the specific 'push' or 'pull' method to use.

...

Other arguments passed to specialized push and pull functions.

x

An R object.

bridge

A Scala bridge.

See Also

scalaPushRegister, scalaPullRegister

Examples

# \donttest{
s <- scala()

s(rn=scalaPush(rnorm),n=5) * 'R.evalD1("%-(%-)",rn,n)'

mtcarsRef <- scalaPush(mtcars, "list")
mtcarsRef$names()
mtcarsRef$mpg()
mtcars2 <- scalaPull(mtcarsRef, "list")
identical(mtcars, mtcars2)

# Oops, the variable names are bad...
tryCatch(ref <- scalaPush(iris, "list"), error=function(e) e)

# ... so let's clean up the variable names.
irisCleaned <- iris
names(irisCleaned) <- gsub("\\W","_",names(iris))
irisCleaned$Species <- as.character(iris$Species)
ref2 <- scalaPush(irisCleaned, "list")
scalaType(ref2)
ref2$Sepal_Length()
irisCleaned2 <- scalaPull(ref2,"list")
identical(irisCleaned, irisCleaned2)

close(s)
# }