integer-utils {S4Vectors}R Documentation

Some utility functions to operate on integer vectors

Description

Some low-level utility functions to operate on ordinary integer vectors.

Usage

toListOfIntegerVectors(x, sep=",")

## more to come...

Arguments

x

A character vector where each element is a string containing comma-separated integers in decimal representation. Alternatively x can be a list of raw vectors, in which case it's treated like if it was sapply(x, rawToChar).

sep

The separator represented as a single-letter string.

Details

toListOfIntegerVectors is a fast and memory-efficient implementation of

    lapply(strsplit(x, sep, fixed=TRUE), as.integer)

but, unlike the above code, it will raise an error if the input contains NAs or strings that don't represent integer values.

Value

A list parallel to x where each list element is an integer vector.

Author(s)

Hervé Pagès

See Also

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 <- toListOfIntegerVectors(x)
y

## When it doesn't choke on an NA or string that doesn't represent
## an integer value, toListOfIntegerVectors() is equivalent to
## the function below but is faster and more memory-efficient:
toListOfIntegerVectors2 <- function(x, sep=",")
{
    lapply(strsplit(x, sep, fixed=TRUE), as.integer)
}
y2 <- toListOfIntegerVectors2(x)
stopifnot(identical(y, y2))

[Package S4Vectors version 0.18.2 Index]