X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=check%2Ftime_gammaseries.cpp;h=cd09eacc7c17e1a732615258ecb6c63d00f3df43;hp=e6ffa8736abe814ab4d963c37893c1326df7576b;hb=5ac42bdaa20f48de408f12db671d4e69ac9987da;hpb=67467d256b44f5e08498ca81c946d9ffaa25d1e2 diff --git a/check/time_gammaseries.cpp b/check/time_gammaseries.cpp index e6ffa873..cd09eacc 100644 --- a/check/time_gammaseries.cpp +++ b/check/time_gammaseries.cpp @@ -3,7 +3,7 @@ * Some timings on series expansion of the Gamma function around a pole. */ /* - * GiNaC Copyright (C) 1999-2008 Johannes Gutenberg University Mainz, Germany + * GiNaC Copyright (C) 1999-2010 Johannes Gutenberg University Mainz, Germany * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -20,25 +20,26 @@ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ -#include -#include #include "ginac.h" #include "timer.h" -using namespace std; using namespace GiNaC; +#include +#include +using namespace std; + unsigned tgammaseries(unsigned order) { unsigned result = 0; symbol x; - ex myseries = series(tgamma(x),x==0,order); + ex myseries = series(GiNaC::tgamma(x),x==0,order); // compute the last coefficient numerically: ex last_coeff = myseries.coeff(x,order-1).evalf(); // compute a bound for that coefficient using a variation of the leading // term in Stirling's formula: ex bound = exp(-.57721566490153286*(order-1))/(order-1); - if (abs((last_coeff-pow(-1,order))/bound) > 1) { + if (abs((last_coeff-pow(-1,ex(order)))/bound) > 1) { clog << "The " << order-1 << "th order coefficient in the power series expansion of tgamma(0) was erroneously found to be " << last_coeff << ", violating a simple estimate." << endl;