| double {base} | R Documentation |
Double Precision Vectors
Description
Create, coerce to or test for a double-precision vector.
Usage
double(length = 0)
as.double(x, ...)
is.double(x)
single(length = 0)
as.single(x, ...)
Arguments
length |
desired length. |
x |
object to be coerced or tested. |
... |
further arguments passed to or from other methods. |
Value
double creates a double precision vector of the specified
length. The elements of the vector are all equal to 0.
as.double attempts to coerce its argument to be of double
type.
is.double returns TRUE or FALSE depending on
whether its argument is of double type or not.
Note
R has no single precision data type. All real numbers are
stored in double precision format. The functions as.single
and single are identical to as.double and double
except they set the attribute Csingle that is used in the
.C and .Fortran interface, and they are
intended only to be used in that context.
See Also
integer.
Examples
is.double(1)
all(double(3) == 0)