default.formatter: Default formatter for hmr

In s-u/hmr: High-Performance Hadoop Map/Reduce R Interface

Description

This function provides the default formatter for the hmr function; it assumes that the key is seperated from the rest of the row by a tab character, and the elements of the row are seperated by the pipe ("|") character. Vector and matrix objects returned from the output of a map or reduce step in hmr should be directly readable by .default.formatter.

Usage

.default.formatter(x)

Arguments

x	character vector (each element is treated as a row) or a raw vector (LF characters '\n' separate rows) to split

Value

Either a character matrix with a row for each element in the input, or a character vector with an element for each element in the input. The latter occurs when only one column (not counting the key) is detected in the input. The keys are stored as rownames or names, respectively.

Author(s)

Simon Urbanek

See Also

mstrsplit

Examples

  c <- c("A\tB|C|D", "A\tB|B|B", "B\tA|C|E")
  .default.formatter(c)
  
  c <- c("A\tD", "A\tB", "B\tA")
  .default.formatter(c)

s-u/hmr documentation built on June 8, 2020, 3:55 p.m.