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