Tests whether an object is a vector or not
The is.vector function returns a FALSE
value in some cases where intuitively one might
expect a TRUE value to be returned. For example,
is.vector(z) returns FALSE for each of the
following:
z <- 1:3;names(z) <- 1:3
z <- matrix(1:3, nrow=1)
z <- matrix(1:3, ncol=1)
These results are not necessarily incorrect, they are
just one interpretion of the definition of a vector.
Contrarily, the isNumericAtomicVector(z) function returns
TRUE for each of the above examples. Thus,
isNumericAtomicVector expands the basic definition of a
vector to allow matrices containing a single row
or column and named vectors. Also, unlike is.vector,
isNumericAtomicVector returns FALSE for objects of class list.
isNumericAtomicVector(x)
x |
an object of arbitrary class. |
a vector of character strings containing the result. The length
of this vector is equal to length(x).
## cases where isNumericAtomicVector returns ## TRUE z <- 1:3;names(z) <- letters[1:3] isNumericAtomicVector(z) isNumericAtomicVector(matrix(1:3, nrow=1)) isNumericAtomicVector(matrix(1:3, ncol=1)) isNumericAtomicVector(1:5) isNumericAtomicVector(letters) ## cases where isNumericAtomicVector returns ## FALSE isNumericAtomicVector(list(1:3)) isNumericAtomicVector(data.frame(1:3,2:4)) isNumericAtomicVector(matrix(1:12, nrow=4))
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