RMVL (version 1.1.0.1)

mvl_get_groups: 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)

Value

a vector of indices

Arguments

prev

MVL_OBJECT prev computed by mvl_write_groups

first_indices

indices from first vector computed by mvl_write_groups

See Also

mvl_group

Examples

if (FALSE) {
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]))
}