Is an Argument a Numeric Vector?

Checks if an argument is a numeric vector

assert_numeric_vector(
  arg,
  length = NULL,
  optional = FALSE,
  arg_name = rlang::caller_arg(arg),
  message = NULL,
  class = "assert_numeric_vector",
  call = parent.frame()
)

Arguments

arg

A function argument to be checked

Default value: none

length

Expected length

If the argument is not specified or set to NULL, any length is accepted.

Default value: NULL

optional

Is the checked argument optional? If set to FALSE and arg is NULL then an error is thrown

Default value: FALSE

arg_name

string indicating the label/symbol of the object being checked.

Default value: rlang::caller_arg(arg)

message

string passed to cli::cli_abort(message). When NULL, default messaging is used (see examples for default messages). "{arg_name}" can be used in messaging.

Default value: NULL

class

Subclass of the condition.

call

The execution environment of a currently running function, e.g. call = caller_env(). The corresponding function call is retrieved and mentioned in error messages as the source of the error.

You only need to supply call when throwing a condition from a helper function which wouldn't be relevant to mention in the message.

Can also be NULL or a defused function call to respectively not display any call or hard-code a code to display.

For more information about error calls, see Including function calls in error messages.

Value

The function throws an error if arg is not a numeric vector. Otherwise, the input is returned invisibly.

Checks for valid input and returns warning or errors messages: assert_atomic_vector(), assert_character_scalar(), assert_character_vector(), assert_data_frame(), assert_date_vector(), assert_expr(), assert_expr_list(), assert_filter_cond(), assert_function(), assert_integer_scalar(), assert_list_element(), assert_list_of(), assert_logical_scalar(), assert_named(), assert_one_to_one(), assert_param_does_not_exist(), assert_s3_class(), assert_same_type(), assert_symbol(), assert_unit(), assert_vars(), assert_varval_list()

Examples

example_fun <- function(num) {
  assert_numeric_vector(num)
}

example_fun(1:10)

try(example_fun(letters))
#> Error in example_fun(letters) : 
#>   Argument `num` must be a numeric vector, but it is a character vector.

example_fun <- function(num) {
  assert_numeric_vector(num, length = 2)
}

try(example_fun(1:10))
#> Error in example_fun(1:10) : 
#>   Argument `num` must be a vector of length 2, but has length 10.

Arguments

Value

See also

Examples