as.data.frame.HDF5Matrix: Convert HDF5Matrix to data.frame

In BigDataStatMeth: Title: Scalable Statistical Computing with HDF5-Backed Matrices

Convert HDF5Matrix to data.frame

Description

Reads entire HDF5 dataset into memory as a data.frame. WARNING: This loads all data into RAM.

Usage

## S3 method for class 'HDF5Matrix'
as.data.frame(
  x,
  row.names = NULL,
  optional = FALSE,
  force = FALSE,
  max_size_mb = NULL,
  ...
)

Arguments

x	An HDF5Matrix object
row.names	Logical or character vector. Row names to use.
optional	Logical. Passed to as.data.frame.
force	Logical. If TRUE, skip size warnings.
max_size_mb	Numeric. Maximum size in MB to convert without warning.
...	Additional arguments passed to as.data.frame

Details

First converts to matrix using as.matrix.HDF5Matrix (with same size checks), then to data.frame. All memory warnings apply.

Value

data.frame with data from HDF5 file

See Also

as.matrix.HDF5Matrix

Examples

    fn <- tempfile(fileext = ".h5")
    X <- hdf5_create_matrix(fn, "data/X", data = matrix(rnorm(500), 100, 5))
    df <- as.data.frame(X)
    hdf5_close_all()
    unlink(fn)

BigDataStatMeth documentation built on May 15, 2026, 1:07 a.m.