Check the class of an object
On Jul 23, 2013, at 5:36 AM, Simon Zehnder wrote:
Dear R-Users and R-Devels,
I have large project based on S4 classes. While writing my unit tests I found out, that 'is' cannot test for a specific class, as also inherited classes can be treated as their super classes. I need to do checks for specific classes. What I do right now is sth. like
if (class(myClass) == "firstClass") {
I would think that you would need to use `%in%` instead.
if( "firstClass" %in% class(myObject) ){
Objects can have more than one class, so testing with "==" would fail in those instances.
} else if (class(myClass) == "secondClass") {
}
Is this the usual way how classes are checked in R?
Well, `inherits` IS the usual way.
I was expecting some specific method (and 'inherits' or 'extends' is not what I look for)... Best Simon [[alternative HTML version deleted]]
Plain-text format is the recommended format for Rhelp
David Winsemius Alameda, CA, USA