"Chris Weed" writes:

Hi, I am getting the wrong result for the exponential of complex numbers such as the following:

#include #include #include <iostream>

int main() { typedef boost::mpl::math::string_c_to_double<'-',2,'.',0>::type minus_two;

I don't know anything about Boost.MPLMath, but I suspect that the 2 and the 0 need to be quoted also. -- Dave Abrahams Boost Consulting www.boost-consulting.com

--- Chris Weed wrote:

Hi, I am getting the wrong result for the exponential of complex numbers such as the following:

#include #include #include <iostream>

int main() { typedef

boost::mpl::math::string_c_to_double<'-',2,'.',0>::type

minus_two; typedef

boost::mpl::timesboost::mpl::math::double_tag

...

::type minus_two_pi; typedef

boost::mpl::math::complex_number

imag_minus_two_pi; std::cout << imag_minus_two_pi() << std::endl;

std::cout <<

boost::mpl::math::exponential::type()

<< std::endl; return 0; }

This prints: 0-6.28319i 1.0329-0.0109834i

which should be 0-6.28319i 1.0000-0.00000i

Chris

The problem was in the sine and cosine functions, which by default lose their accuracy when the angle is beyond tha range (-pi/2,pi/2). I've fixed their implementations to take advantage of the fact that they are periodic functions; however, this also reintroduces recursive template instantiation. Your program now resides in the example directory as complex_exponential.cpp; note that I've changed the semantics of the tagged constants. The metafunctions pi<> et al. take in primitive numeric types, e.g. int, double; if you wish to pass in numeric tags, use pi_dispatch<>, etc. Cromwell D. Enage ____________________________________________________________________________________ Do you Yahoo!? Everyone is raving about the all-new Yahoo! Mail beta. http://new.mail.yahoo.com