Detailed information about the format of the tables

Usage

# S3 method for chMDB
dims(x, ...)

# S3 method for fileMDB
dims(
  x,
  ...,
  by = 1000,
  estimateThr = 5e+07,
  estimateSample = 10^6,
  showWarnings = TRUE
)

dims(x, ...)

# S3 method for memoMDB
dims(x, ...)

# S3 method for metaMDB
dims(x, ...)

Arguments

x: an object with embedded data tables
...: the name of the tables to consider (default: all of them)
by: the size of the batch: number of lines to count together (default: 1000)
estimateThr: file size threshold in bytes from which an estimation of row number should be computed instead of a precise count (default: 50000000 = 50MB)
estimateSample: number of values on which the estimation is based (default: 10^6)
showWarnings: a warning is raised by default if estimation is done.

Value

A tibble with one row for each considered table and the following columns:

name: the name of the table
format: "table", "matrix" or "MatrixMarket"
ncol: number of columns
nrow: number of rows
records: number of records (nrow for tables and ncol*nrow for matrices)
bytes: size in bytes
transposed: FALSE by default. TRUE only for matrices stored in a transposed format.