Parameters for chk functions
Descriptions of the parameters and return values for the chk functions
x |
The object to check. |
x_name |
A string of the name of object x or NULL. |
y |
An object to check against. |
chk |
A flag specifying whether to check the other parameters. |
chk_fun |
A chk_ function. |
tolerance |
A non-negative numeric scalar. |
ext |
A character vector of the permitted file extensions (without the .). |
exists |
A flag specifying whether the files/directories must (or must not) exist. |
value |
A non-missing scalar of a value. |
range |
A non-missing sorted vector of length 2 of the lower and upper permitted values. |
regexp |
A string of a regular expression. |
values |
A vector of the permitted values. |
class |
A string specifying the class. |
formals |
A count of the number of formal arguments. |
incomparables |
A vector of values that cannot be compared. FALSE means that all values can be compared. |
by |
A character vector specifying the column names to join x and y on. If named the names are the corresponding columns in x. |
exclusive |
A flag specifying whether x must only include columns named in values. |
order |
A flag specifying whether the order of columns in x must match names in values. |
nrow |
A flag or a whole numeric vector of the value, value range or possible values. |
key |
A character vector of the columns that represent a unique key. |
vld_fun |
A vld_ function. |
... |
Additional arguments. |
The chk_ function throws an informative error if the test fails.
The vld_ function returns a flag indicating whether the test was met.
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