strutils {IRanges}R Documentation

Low-level string utilities

Description

Some low-level string utilities that operate on ordinary character vectors. For more advanced string manipulations, see the Biostrings package.

Usage

  strsplitAsListOfIntegerVectors(x, sep=",")

Arguments

x A character vector where each element is a string containing comma-separated decimal integer values.
sep The value separator character.

Value

A list of integer vectors. The list is of the same length as the input.

Note

strsplitAsListOfIntegerVectors is similar to the strsplitAsListOfIntegerVectors2 function shown in the Examples section below, except that the former generally raises an error where the latter would have inserted an NA in the returned object. More precisely:

When it fails, strsplitAsListOfIntegerVectors will print an informative error message. Finally, strsplitAsListOfIntegerVectors is faster and uses much less memory than strsplitAsListOfIntegerVectors2.

Author(s)

H. Pages

See Also

strsplit

Examples

  x <- c("1116,0,-19",
         " +55291 , 2476,",
         "19184,4269,5659,6470,6721,7469,14601",
         "7778889, 426900, -4833,5659,6470,6721,7096",
         "19184 , -99999")
  y <- strsplitAsListOfIntegerVectors(x)
  y

  ## In normal situations (i.e. when the input is well-formed),
  ## strsplitAsListOfIntegerVectors() does actually the same as the
  ## function below but is faster and much more memory efficient:
  strsplitAsListOfIntegerVectors2 <- function(x, sep=",")
  {
    tmp <- strsplit(x, sep, fixed = TRUE)
    lapply(tmp, as.integer)
  }
  y2 <- strsplitAsListOfIntegerVectors2(x)
  stopifnot(identical(y, y2))

[Package IRanges version 1.6.16 Index]