| is.isoweek | R Documentation | 
Take a numeric vector and return TRUE if values are valid ISO week numbers (of the
form YYYYWW), or FALSE otherwise.
is.isoweek(x)
x | 
 A numeric vector of ISO week numbers (of format YYYYWW)  | 
A logical vector of the same length as x
is.isoweek(c(202053, 202153))  # returns c(TRUE, FALSE)
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.