Test if an object is of class prevR.
This function test if the class of an object is prevR.
It could be used to test the slot
rings or the slot
object to test.
"clusters", "rings","boundary" or "proj".
boundary are always present in an object of class
rings could be
boundary a sp::SpatialPolygons with an
valid with the value
FALSE (when boundaries of the studied
area have not been specified explicitly).
is.prevR(object,"rings") will return
boundary has an attribute
valid equal to
is.prevR(object,"boundary") will return
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