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- /* integration/qk41.c
- *
- * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Brian Gough
- *
- * 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
- * the Free Software Foundation; either version 3 of the License, or (at
- * your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- */
- #include "gsl__config.h"
- #include "gsl_integration.h"
- /* Gauss quadrature weights and kronrod quadrature abscissae and
- weights as evaluated with 80 decimal digit arithmetic by
- L. W. Fullerton, Bell Labs, Nov. 1981. */
- static const double xgk[21] = /* abscissae of the 41-point kronrod rule */
- {
- 0.998859031588277663838315576545863,
- 0.993128599185094924786122388471320,
- 0.981507877450250259193342994720217,
- 0.963971927277913791267666131197277,
- 0.940822633831754753519982722212443,
- 0.912234428251325905867752441203298,
- 0.878276811252281976077442995113078,
- 0.839116971822218823394529061701521,
- 0.795041428837551198350638833272788,
- 0.746331906460150792614305070355642,
- 0.693237656334751384805490711845932,
- 0.636053680726515025452836696226286,
- 0.575140446819710315342946036586425,
- 0.510867001950827098004364050955251,
- 0.443593175238725103199992213492640,
- 0.373706088715419560672548177024927,
- 0.301627868114913004320555356858592,
- 0.227785851141645078080496195368575,
- 0.152605465240922675505220241022678,
- 0.076526521133497333754640409398838,
- 0.000000000000000000000000000000000
- };
- /* xgk[1], xgk[3], ... abscissae of the 20-point gauss rule.
- xgk[0], xgk[2], ... abscissae to optimally extend the 20-point gauss rule */
- static const double wg[11] = /* weights of the 20-point gauss rule */
- {
- 0.017614007139152118311861962351853,
- 0.040601429800386941331039952274932,
- 0.062672048334109063569506535187042,
- 0.083276741576704748724758143222046,
- 0.101930119817240435036750135480350,
- 0.118194531961518417312377377711382,
- 0.131688638449176626898494499748163,
- 0.142096109318382051329298325067165,
- 0.149172986472603746787828737001969,
- 0.152753387130725850698084331955098
- };
- static const double wgk[21] = /* weights of the 41-point kronrod rule */
- {
- 0.003073583718520531501218293246031,
- 0.008600269855642942198661787950102,
- 0.014626169256971252983787960308868,
- 0.020388373461266523598010231432755,
- 0.025882133604951158834505067096153,
- 0.031287306777032798958543119323801,
- 0.036600169758200798030557240707211,
- 0.041668873327973686263788305936895,
- 0.046434821867497674720231880926108,
- 0.050944573923728691932707670050345,
- 0.055195105348285994744832372419777,
- 0.059111400880639572374967220648594,
- 0.062653237554781168025870122174255,
- 0.065834597133618422111563556969398,
- 0.068648672928521619345623411885368,
- 0.071054423553444068305790361723210,
- 0.073030690332786667495189417658913,
- 0.074582875400499188986581418362488,
- 0.075704497684556674659542775376617,
- 0.076377867672080736705502835038061,
- 0.076600711917999656445049901530102
- };
- void
- gsl_integration_qk41 (const gsl_function * f, double a, double b,
- double *result, double *abserr,
- double *resabs, double *resasc)
- {
- double fv1[21], fv2[21];
- gsl_integration_qk (21, xgk, wg, wgk, fv1, fv2, f, a, b, result, abserr, resabs, resasc);
- }
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