| integer {base} | R Documentation |
Creates or tests for objects of type "integer".
integer(length = 0) as.integer(x, ...) is.integer(x)
length |
desired length. |
x |
object to be coerced or tested. |
... |
further arguments passed to or from other methods. |
integer creates a integer vector of the specified length.
Each element of the vector is equal to 0.
Integer vectors exist so that data can be passed to C or Fortran code
which expects them.
as.integer attempts to coerce its argument to be of integer
type. The answer will be NA unless the coercion succeeds.
Real values larger in modulus than the largest integer are coerced to
NA (unlike S which gives the most extreme integer of the same sign).
Non-integral numeric values are truncated towards zero (i.e.,
as.integer(x) equals trunc(x) there), and
imaginary parts of complex numbers are discarded (with a warning).
Like as.vector it strips attributes including names.
is.integer returns TRUE or FALSE depending on
whether its argument is of integer type or not.
is.integer is generic: you can write methods to handle
specific classes of objects, see InternalMethods.
Note that factors are true for is.integer but false for
is.numeric.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
round (and ceiling and floor on that help
page) to convert to integral values.
## as.integer() truncates: x <- pi * c(-1:1,10) as.integer(x)