/**
* evaluate the LND6 function at the given point <CODE>x</CODE>.
*
* @param arg Object must be a <CODE>double[]</CODE> or a <CODE>popt4jlib.VectorIntf</CODE>
* object.
* @param p HashMap unused.
* @throws IllegalArgumentException if <CODE>arg</CODE> is not of the mentioned types.
* @return double
*/
public double eval(Object arg, HashMap p) throws IllegalArgumentException {
if (arg instanceof VectorIntf) {
VectorIntf x = (VectorIntf) arg;
return evalArray(x.getDblArray1());
} else {
try {
return evalArray((double[]) arg);
} catch (Exception e) {
e.printStackTrace();
throw new IllegalArgumentException("function cannot be evaluated at the passed argument");
}
}
}
