10.3.5 Use the ore.groupApply Function
The ore.groupApply function calls 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 runs, 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:
- Partition on a Single Column
This example uses theore.groupApplyfunction and partitions the data on a single column. - Partition on Multiple Columns
This example uses theore.groupApplyfunction and partitions the data on multiple columns.
Parent topic: R Interface for Embedded R Execution