single
Single Precision Objects

### Description

Creates or tests for numeric objects with mode equal to "single".

### Usage

    single(length = 0L)
    is.single(x)
    as.single(x, ...)
    ## Default S3 method:
    as.single(x, ...)

### Arguments

length | the length desired for the resulting object.
x | any object.
... | other arguments to pass to or from other functions.

### Details

Usually, you need vectors of mode "single" only if you are using the interface to a Fortran subroutine with arguments that are declared REAL, or a C function with arguments that are declared float. (see .Fortran)
Note the difference between using as.single and mode(x) <- "single". The former strips all attributes; the latter does not strip attributes (that is, a matrix stays a matrix).
as.single is generic. Only the default method is implemented at present.
Value

single | returns a simple object of storage mode "double" and the length specified. It has the attribute "Csingle" set to TRUE.
is.single | always gives an error.
as.single.default | returns x if x is a simple object of mode "single". Otherwise, it returns a simple object of the same length as x ,and with data resulting from coercing the elements of x to storage mode "double". Attributes are replaced with a single attribute "Csingle" set to TRUE.

See Also
.Fortran, mode, numeric, double, integer.
Examples

    x <- c(3.14, 92)
    # Call a .Fortran routine 'mysub'.
    # as.single is used to tell .Fortran to pass x as single-precision
    # floating point values
    # single(length(x)) is used to create an output buffer for the call
    # to fill in.
    ## Not run:
    y <- .Fortran("mysub", as.single(x), single(length(x)))[[2]]

    ## End(Not run)

Package base version 6.1.5-18
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