an object of class fPFOLIODATA, fPFOLIOSPEC or
fPORTFOLIO.
...
optional arguments to be passed.
References
Wuertz, D., Chalabi, Y., Chen W., Ellis A. (2009);
Portfolio Optimization with R/Rmetrics,
Rmetrics eBook, Rmetrics Association and Finance Online, Zurich.