makeH5Index: Create a index table for an HDF5 dataset based on column

In MirceaDavidEsc/bigh5: Efficiently access HDF5 files using factor indexing

Description

makeH5Index takes a specified HDF5 dataset in a given file, and produces an index of the data based off of entries in a specified column of the dataset. This function assumes datasetName is sorted by the column that will be used as an index. If not, the user should use sortByIndex to produce a sorted dataset for indexing.

Usage

makeH5Index(filename, datasetName, indexCol, dataIndexName, rowSize = 1e+06)

Arguments

filename	String specifying the h5 file.
datasetName	The dataset to be indexed.
indexCol	The column that stores indexing entries.
dataIndexName	The index dataset name.
rowSize	A parameter to specify how many rows of data to load at any time.

Value

The data frame that specifies the row indices.

Examples

makeH5Index("foo.h5","/theData",3,"frameIndices")

MirceaDavidEsc/bigh5 documentation built on May 7, 2019, 4:58 p.m.