mvl_fused_write_objects: Concatenate objects and write result into MVL file.

In RMVL: Mappable Vector Library for Handling Large Datasets

Concatenate objects and write result into MVL file.

Description

This function can concatenate a mixture of R and MVL objects. For vectors it is the equivalent of c(). For array and matrices it works as cbind() For data frames it works as rbind, but row names are always dropped.

Usage

mvl_fused_write_objects(MVLHANDLE, L, name = NULL, drop.rownames = TRUE)

Arguments

MVLHANDLE	a handle to MVL file produced by mvl_open()
L	a list of suitable R objects (vector, array, data.frame) or equivalent MVL objects.
name	if specified add a named entry to MVL file directory
drop.rownames	set to TRUE to prevent rownames from being written

Value

any object of class MVL_OFFSET that describes an offset into this MVL file. MVL offsets are vectors and can be concatenated. They can be written to MVL file directly, or as part of another object such as list.

Examples

## Not run: 
Mtmp<-mvl_open("tmp_a.mvl", append=TRUE, create=TRUE)
mvl_write_object(Mtmp, runif(100), "vec1")
mvl_write_object(Mtmp, runif(100), "vec2")
Mtmp<-mvl_remap(Mtmp)
mvl_fused_write_objects(Mtmp, list(Mtmp["vec1", ref=TRUE], Mtmp["vec2", ref=TRUE], runif(3)),
                                                                                  name="vec3")

## End(Not run)

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