integer-utils {S4Vectors} | R Documentation |
Some low-level utility functions to operate on ordinary integer vectors.
toListOfIntegerVectors(x, sep=",") ## more to come...
x |
A character vector where each element is a string containing
comma-separated integers in decimal representation.
Alternatively |
sep |
The separator represented as a single-letter string. |
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.
A list parallel to x
where each list element is an integer
vector.
Hervé Pagès
The strsplit
function in the base
package.
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))