opal.assign: Data or expression assignment
In datashield/opal: Opal R and Datashield utils

Assign a Opal table, or a R expression or a R object to a R symbol in the current R session.

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opal.assign(opal, symbol, value, variables = NULL, missings = FALSE,
  identifiers = NULL, id.name = NULL, updated.name = NULL,
  async = FALSE)

`opal`	Opal object or list of opal objects.
`symbol`	Name of the R symbol.
`value`	The value to assign evaluated in the following order: a R expression, a function, a fully qualified name of a variable or a table in Opal or any other R object (data.frame, vector).
`variables`	List of variable names or Javascript expression that selects the variables of a table (ignored if value does not refere to a table). See javascript documentation: http://wiki.obiba.org/display/OPALDOC/Variable+Methods
`missings`	If TRUE, missing values will be pushed from Opal to R, default is FALSE. Ignored if value is an R expression.
`identifiers`	Name of the identifiers mapping to use when assigning entities to R (from Opal 2.0).
`id.name`	Add a vector with the given name representing the entity identifiers (from Opal 2.6). Default is NULL.
`updated.name`	Add a vector with the given name representing the creation and last update timestamps (from Opal 2.6). Default is NULL.
`async`	R script is executed asynchronously within the session (default is FALSE). If TRUE, the value returned is the ID of the command to look for (from Opal 2.1).

## Not run: 
# assign a list of variables from table HOP of opal object o
opal.assign(o, symbol="D", value="demo.HOP", variables=list("GENDER","LAB_GLUC"))

# assign all the variables matching 'LAB' from table HOP of opal object o
opal.assign(o, symbol="D", value="demo.HOP", variables="name().matches('LAB_')")

# assign a function and call it
opal.assign.script(o, 'hello', quote(function(x) { print(paste0('Hello ', x , '!'))}))
opal.execute(o, "hello('Mr Bean')")

# push an arbitrary data frame to the R server
opal.assign(o, "D", mtcars)

# push an arbitrary vector to the R server
opal.assign(o, "C", mtcars$cyl)

## End(Not run)