type.convert {utils}R Documentation

Type Conversion on Character Variables


Convert a character vector to logical, integer, numeric, complex or factor as appropriate.


type.convert(x, na.strings = "NA", as.is = FALSE, dec = ".")


x a character vector.
na.strings a vector of strings which are to be interpreted as NA values. Blank fields are also considered to be missing values in logical, integer, numeric or complex vectors.
as.is logical. See Details.
dec the character to be assumed for decimal points.


This is principally a helper function for read.table. Given a character vector, it attempts to convert it to logical, integer, numeric or complex, and failing that converts it to factor unless as.is = TRUE. The first type that can accept all the non-missing values is chosen.

Vectors which are entirely missing values are converted to logical, since NA is primarily logical.


A vector of the selected class, or a factor.

See Also


[Package utils version 2.5.0 Index]