ff (version 4.5.2)

as.ffdf: Coercing to ffdf and data.frame

Description

Functions for coercing to ffdf and data.frame

Usage

as.ffdf(x, ...)
# S3 method for ff_vector
as.ffdf(x, ...)
# S3 method for ff_matrix
as.ffdf(x, ...)
# S3 method for data.frame
as.ffdf(x, vmode=NULL, col_args = list(), ...)
# S3 method for ffdf
as.data.frame(x, ...)

Value

'as.ffdf' returns an object of class ffdf, 'as.data.frame' returns an object of class data.frame

Arguments

x

the object to be coerced

vmode

optional specification of the vmodes of columns of the data.frame. Either a character vector of vmodes (named with column names of the data.frame or recycled if not named) or a list named with vmodes where each element identifies those columns of the data.frame that should get the vmode encoded in the name of the element

col_args

further arguments; passed to ff

...

further arguments; passed to ffdf for .ff_vector, .ff_matrix and .data.frame methods, ignored for .ffdf identity method

Author

Jens Oehlschlägel

See Also

is.ffdf, ffdf, data.frame

Examples

  d <- data.frame(x=1:26, y=letters, z=Sys.time()+1:26, stringsAsFactors = TRUE)
  ffd <- as.ffdf(d)
  stopifnot(identical(d, as.data.frame(ffd)))
  rm(ffd); gc()