Set of "or" classes are created for compatibility reasons.
nl.fittorNULL nl.fitt
object or NULL
functionorNULL function
object or NULL
expressionorNULL expression
object or NULL
callorNULLcall
object or NULL
integerorNULLinteger
object or NULL
numericorNULLnumeric
object or NULL
characterorNULLcharacter
object or NULL
logicalorNULLlogical
object or NULL
listorNULLlist
object or NULL
nl.fitt.roborNULLnl.fitt.rob
object or NULL
fittmethodorNULLfittmethod
object or NULL
vectororNULLvector
object or NULL
matrixororNULLmatrix
object or NULL
vectororMatrixvector
object or matrix