A set of predicates and assertions for checking the properties of variables, such as length, names and attributes. Most of the documentation is on the assertive page. End-users will usually want to use assertive directly.
To install the stable version, type:
install.packages("assertive.properties")To install the development version, you first need the remotes package.
install.packages("remotes")Then you can install the assertive.properties package using
library(remotes)
install_bitbucket("richierocks/assertive.properties")has_attributes checks a variable for the presence of
named attributes. has_any_attributes and
has_no_attributes check for the presence or absence of any
attributes at all.
has_dims, has_rows, and
has_cols check for the dimensions, rows and columns
respectively.
has_duplicates and has_no_duplicates check
whether or not a vector has duplicate elements.
has_names, has_dimnames,
has_rownames, and has_colnames check for
various types of name.
is_atomic, is_recursive, and
is_vector check for these types of variables.
is_empty, is_non_empty,
is_scalar, and is_non_scalar check for objects
of length 0 or 1 (or objects with 0/1 element).
is_of_length, has_elements, and
is_of_dimension provide more general variable size
checks.
are_same_length and have_same_dims check
for two variables having the same length/dimensions.
is_null and is_not_null check whether an
object is NULL or not.
is_unsorted checks for unsorted vectors.
Predicates that return a vector have two corresponding assertions.
For example, has_attributes has
assert_has_all_attributes and
assert_has_any_attributes.
Predicates returning a single logical value have one corresponding
assertion. For example, is_null has
assert_is_null.
DIM returns the dimension of an object, and works with
vectors (like NROW and NCOL).
n_elements returns the number of elements in an
object.