Computes an estimate of the definite integral of a function of known analytical form, using a Gaussian quadrature formula with a specified number of abscissae. Formulae are provided for a finite interval (Gauss-Legendre), a semi-infinite interval (Gauss-Laguerre, Gauss-Rational), and an infinite interval (Gauss-Hermite). Classes : H2a1a2 . Nonautomatic 1-D finite interval quadrature, integrand available via user-defined procedure H2a3a2 . Nonautomatic 1-D semi-infinite interval quadrature (including exp(-x) weight function), integrand available via user-defined procedure H2a4a2 . Nonautomatic 1-D infinite interval quadrature (including exp(-x**2) weight function), integrand available via user-defined procedure Type : C subroutine in NAGC library (D01 sublibrary). Access : Proprietary. Many implementations available. Precision: Double. Note : This procedure may also be invoked using the name d01tac. Usage : double nag_1d_quad_gauss_1(Nag_GaussFormulae quadrule, double (*f)(double x, Nag_User *comm), double a, double b, Integer npts, Nag_User *comm, NagError *fail) Details : Documentation Example Example-output Local-details Sites : (1) ITL
ITL: Unix Workstation Network, National Institute of Standards and Technology (NIST), Gaithersburg, MD. Available to NIST staff. Precision: Double. Note : This procedure may also be invoked using the name d01tac. Access available only to NIST staff on internal Unix systems. They may access this package provided the /itl tree is cross-mounted. Link : cc -I/itl/links/generic/include -o prog prog.c -L/itl/links/generic/{lib lib32 lib64}{/mips3 /mips4} -lnagc -lm Local-details: cat /itl/apps/nagclib-6/docs/implementation Documentation: acroread /itl/apps/nagclib-6/docs/NAGdoc/cl/pdf/D01/d01tac_cl05.pdf Example : cat /itl/apps/nagclib-6/clsol06da/examples/source/d01tace.c Example-outpu: cat /itl/apps/nagclib-6/clsol06da/examples/results/d01tace.r
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