| type.convert {utils} | R Documentation |
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
|
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.
Vectors containing F, T, FALSE, TRUE or
values from na.strings are converted to logical. Vectors
containing optional whitespace followed by decimal constants
representable as R integers or values from na.strings are
converted to integer. Other vectors containing optional whitespace
followed by other decimal or hexadecimal constants (see
NumericConstants), or NaN, Inf or infinity
(ignoring case) or values from na.strings are converted to
numeric.
Since this is a helper function, the caller should always pass an
appropriate value of as.is.
A vector of the selected class, or a factor.