data.table (version 1.10.4-2)

print.data.table: data.table Printing Options

Description

print.data.table extends the functionalities of print.data.frame.

Key enhancements include automatic output compression of many observations and concise column-wise class summary.

Usage

# S3 method for data.table
print(x,
    topn=getOption("datatable.print.topn"),          # default: 5
    nrows=getOption("datatable.print.nrows"),        # default: 100
    class=getOption("datatable.print.class"),  # default: FALSE
    row.names=getOption("datatable.print.rownames"), # default: TRUE
    quote=FALSE,...)

Arguments

x

A data.table.

topn

The number of rows to be printed from the beginning and end of tables with more than nrows rows.

nrows

The number of rows which will be printed before truncation is enforced.

class

If TRUE, the resulting output will include above each column its storage class (or a self-evident abbreviation thereof).

row.names

If TRUE, row indices will be printed alongside x.

quote

If TRUE, all output will appear in quotes, as in print.default.

…

Other arguments ultimately passed to format.

Details

By default, with an eye to the typically large number of observations in a codedata.table, only the beginning and end of the object are displayed (specifically, head(x, topn) and tail(x, topn) are displayed unless nrow(x) < nrows, in which case all rows will print).

See Also

print.default

Examples

# NOT RUN {
  #output compression
  DT <- data.table(a = 1:1000)
  print(DT, nrows = 100, topn = 4)
  
  #`quote` can be used to identify whitespace
  DT <- data.table(blanks = c(" 12", " 34"),
                   noblanks = c("12", "34"))
  print(DT, quote = TRUE)
  
  #`class` provides handy column type summaries at a glance
  DT <- data.table(a = vector("integer", 3), 
                   b = vector("complex", 3),
                   c = as.IDate(paste0("2016-02-0", 1:3)))
  print(DT, class = TRUE)
  
  #`row.names` can be eliminated to save space
  DT <- data.table(a = 1:3)
  print(DT, row.names = FALSE)
# }