[Quantlib-dev] Error with old-style implied vol

[Dirk E. <ed...@de...>]

In the process of updating RQuantLib to 0.3.4, I found that my wrappers
around European and American implied vol no longer work. [ That I found that
is a good thing; R stronly encourages a manual page for every function.
These manual pages usually have examples, and during the 'make check' phase
all of the available examples are run. Quite nice. ]

I do know that I'll have to convert to the new prices one day anyway, but is
there a shortcut to keep the current alive while I prepare one based on the
new pricing engines?  

I include a simple stand-alone below.  It builds fine, compute the NPV of an
option (just to show that it links right etc pp) but abort on implied vol.

CHROOT edd@chibud:~/src/progs/C++$ g++ -Wall -o test_ql_impliedvol
test_ql_impliedvol.cc -lQuantLib
CHROOT edd@chibud:~/src/progs/C++$ ./test_ql_impliedvol
Value:  5.81756
Aborted

Here is the short program:


// implied vol in RQuantLib-0.1.7 blows up with QL 0.3.4

#include <ql/quantlib.hpp>
#include <iostream>

using namespace QuantLib;
using QuantLib::Pricers::EuropeanOption;

int main(void) {
  double underlying = 100;
  double strike = 100;
  double dividendYield = 0.02;
  double riskFreeRate = 0.03;
  double maturity = 0.5; 
  double volatility = 0.2;
  Option::Type optionType = Option::Call;

  EuropeanOption EO = EuropeanOption(optionType, underlying, strike,
				     dividendYield, riskFreeRate, maturity, 
				     volatility);
  std::cout << "Value:  " << EO.value() << std::endl;
  double impliedVol = EO.impliedVolatility(EO.value()+0.1);
  std::cout << "Implied:" << impliedVol << std::endl;
  exit(0);
}


Thanks in advance for any insights.

Dirk


-- 
Those are my principles, and if you don't like them... well, I have others.
                                                -- Groucho Marx