mvl_get_groups: Retrieve indices belonging to one or more groups

In RMVL: Mappable Vector Library for Handling Large Datasets

Retrieve indices belonging to one or more groups

Description

This function is passed the prev vector computed by mvl_write_groups and one or more indices from the first vector.

Usage

mvl_get_groups(prev, first_indices)

Arguments

prev	MVL_OBJECT prev computed by mvl_write_groups
first_indices	indices from first vector computed by mvl_write_groups

Value

a vector of indices

See Also

mvl_group

Examples

## Not run: 
Mtmp<-mvl_open("tmp_a.mvl", append=TRUE, create=TRUE)
mvl_write_object(Mtmp, data.frame(x=runif(100), y=1:100), "df1")
Mtmp<-mvl_remap(Mtmp)
mvl_write_groups(Mtmp, list(Mtmp$df1[,"x",ref=TRUE], Mtmp$df1[,"y", ref=TRUE]), "df1_groups")
Mtmp<-mvl_remap(Mtmp)
print(mvl_get_groups(Mtmp["df1_groups", ref=TRUE]["prev", ref=TRUE], Mtmp$df1_groups$first[1:5]))

## End(Not run)

RMVL documentation built on Nov. 2, 2023, 6:09 p.m.