Thank you. That worked. On Fri, 14 Aug 2020 at 05:23, John Maddock via Boost-users < boost-users@lists.boost.org> wrote:
> > On 14/08/2020 01:07, Anirban Pal via Boost-users wrote: > > Hello everyone, > > > > I'm new to using boost and I'm trying to use its quadrature routines, > > specifically > > the *tanh_sinh* integrator. I'm trying to run the examples here: > > > > <goog_14736225> > > > https://www.boost.org/doc/libs/1_66_0/libs/math/doc/html/math_toolkit/double_exponential/de_tanh_sinh.html > > < > https://www.boost.org/doc/libs/1_66_0/libs/math/doc/html/math_toolkit/double_exponential/de_tanh_sinh.html > > > > > > I've been successful using it with the *double* datatype. However, I > > can't seem to work with the *Real* datatype. When I run the following, > > I'm successful. > > tanh_sinh<double> integrator; > > auto f = [](double x) { return 5*x + 7; }; > > double Q = integrator.integrate(f); > > Q = integrator.integrate(f, 0.0, 1.1); > > > > But when I run the following: > > auto f = [](Real x) { return log(x)*log(1-x); }; > > Real Q = integrator.integrate(f, (Real) 0, (Real) 1); > > I confess that's not the best example in the docs :( > > The name "Real" is just used as "some kind of floating point type" - > replace with whatever actual type you wish to use. > > > I get the error: > > > > boost_test.cxx: In function ‘int main(int, char**)’: > > boost_test.cxx:47:15: error: ‘Real’ has not been declared > > auto f2 = [](Real x) { return log(x)*log(1-x); }; > > ^~~~ > > boost_test.cxx:48:2: error: ‘Real’ was not declared in this scope > > Real Q2 = integrator.integrate(f2, (Real) 0, (Real) 1); > > > > I think I need to include the right headers for this to go away. > > However, I'm not sure what the correct header file is. > > > > Thank you for your attention. > > > > -- > > Anirban Pal > > > > > > > > > > _______________________________________________ > > Boost-users mailing list > > Boost-users@lists.boost.org > > https://lists.boost.org/mailman/listinfo.cgi/boost-users > > -- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > _______________________________________________ > Boost-users mailing list > Boost-users@lists.boost.org > https://lists.boost.org/mailman/listinfo.cgi/boost-users > -- Anirban Pal
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