Write a Dense Matrix to StreamPress v3 Format — st_write_dense • RcppML

Write a Dense Matrix to StreamPress v3 Format

Usage

st_write_dense(
  x,
  path,
  include_transpose = FALSE,
  chunk_cols = 2048L,
  codec = "raw",
  delta = FALSE,
  verbose = FALSE
)

Arguments

x: A numeric matrix.
path: Output file path. Extension .spz is recommended.
include_transpose: Logical; store transposed panels. Default FALSE.
chunk_cols: Integer; columns per chunk. Default 2048.
codec: Compression codec: "raw", "fp16", "quant8", "fp16_rans", "fp32_rans". Default "raw".
delta: Logical; apply XOR-delta encoding. Default FALSE.
verbose: Logical; print write statistics. Default FALSE.

Value

Invisibly returns a list with write statistics.

See also

st_read_dense, st_write

Examples

# \donttest{
A <- matrix(rnorm(1000), 50, 20)
f <- tempfile(fileext = ".spz")
st_write_dense(A, f, include_transpose = TRUE)
B <- st_read_dense(f)
max(abs(A - B))
#> [1] 1.180149e-07
unlink(f)
# }