mvl_find_matches: Find matching rows

In RMVL: Mappable Vector Library for Handling Large Datasets

Find matching rows

Description

This function is passed two lists of MVL vectors which are interpreted in data.frame fashion. The indices of pairwise matches are returned in order of the arguments ("index1" and "index2"). In addition we return indices describing stretches with "index1" value constant ( stretch_index1[i] to stretch_index1[i+1]-1)

Usage

mvl_find_matches(L1, L2, indices1 = NULL, indices2 = NULL)

Arguments

L1	list of vector like MVL_OBJECTs
L2	list of vector like MVL_OBJECTs
indices1	list of indices into objects to sort. If absent or NULL it is assumed to be from 1 to the length of the object.
indices2	list of indices into objects to sort. If absent or NULL it is assumed to be from 1 to the length of the object.

Value

A list of matches and match stretches

See Also

mvl_hash_vectors, mvl_order_vectors, mvl_group, mvl_find_matches, mvl_indexed_copy, mvl_merge

Examples

## Not run: 
Mtmp<-mvl_open("tmp_a.mvl", append=TRUE, create=TRUE)
mvl_write_object(Mtmp, data.frame(x=rep(c("a", "b"), 50), y=1:100), "df1")
mvl_write_object(Mtmp, data.frame(x=rep(c("b", "c"), 50), y=21:120), "df2")
Mtmp<-mvl_remap(Mtmp)
L<-mvl_find_matches(list(Mtmp$df1[,"x",ref=TRUE], Mtmp$df1[,"y", ref=TRUE]), 
                        list(Mtmp$df2[,"x",ref=TRUE], Mtmp$df2[,"y", ref=TRUE]))

## End(Not run)

RMVL documentation built on Feb. 23, 2025, 3:01 a.m.