The ore.groupApply function invokes an R script with an ore.frame as the input data. The ore.groupApply function passes the ore.frame to the user-defined input function as the first argument to that function. The INDEX argument to the ore.groupApply function specifies the name of a column of the ore.frame by which Oracle Database partitions the rows for processing by the user-defined R function. The ore.groupApply function can use data-parallel execution, in which one or more R engines perform the same R function, or task, on different partitions of data.
The syntax of the ore.groupApply function is the following:
ore.groupApply(X, INDEX, FUN, ..., FUN.VALUE = NULL, FUN.NAME = NULL, FUN.OWNER = NULL,
parallel = getOption("ore.parallel", NULL))
The ore.groupApply function returns an ore.list object or an ore.frame object.
Examples of the use of the ore.groupApply function are in the following topics:
See Also:
"Arguments for Functions that Run Scripts" for descriptions of the arguments to function ore.groupApply
"Installing a Third-Party Package for Use in Embedded R Execution"