1 @cindex Debye functions
3 The Debye functions @math{D_n(x)} are defined by the following integral,
7 D_n(x) = {n \over x^n} \int_0^x dt {t^n \over e^t - 1}
14 D_n(x) = n/x^n \int_0^x dt (t^n/(e^t - 1))
19 For further information see Abramowitz &
20 Stegun, Section 27.1. The Debye functions are declared in the header
21 file @file{gsl_sf_debye.h}.
23 @deftypefun double gsl_sf_debye_1 (double @var{x})
24 @deftypefunx int gsl_sf_debye_1_e (double @var{x}, gsl_sf_result * @var{result})
25 These routines compute the first-order Debye function
26 @math{D_1(x) = (1/x) \int_0^x dt (t/(e^t - 1))}.
27 @comment Exceptional Return Values: GSL_EDOM
30 @deftypefun double gsl_sf_debye_2 (double @var{x})
31 @deftypefunx int gsl_sf_debye_2_e (double @var{x}, gsl_sf_result * @var{result})
32 These routines compute the second-order Debye function
33 @math{D_2(x) = (2/x^2) \int_0^x dt (t^2/(e^t - 1))}.
34 @comment Exceptional Return Values: GSL_EDOM, GSL_EUNDRFLW
37 @deftypefun double gsl_sf_debye_3 (double @var{x})
38 @deftypefunx int gsl_sf_debye_3_e (double @var{x}, gsl_sf_result * @var{result})
39 These routines compute the third-order Debye function
40 @math{D_3(x) = (3/x^3) \int_0^x dt (t^3/(e^t - 1))}.
41 @comment Exceptional Return Values: GSL_EDOM, GSL_EUNDRFLW
44 @deftypefun double gsl_sf_debye_4 (double @var{x})
45 @deftypefunx int gsl_sf_debye_4_e (double @var{x}, gsl_sf_result * @var{result})
46 These routines compute the fourth-order Debye function
47 @math{D_4(x) = (4/x^4) \int_0^x dt (t^4/(e^t - 1))}.
48 @comment Exceptional Return Values: GSL_EDOM, GSL_EUNDRFLW
51 @deftypefun double gsl_sf_debye_5 (double @var{x})
52 @deftypefunx int gsl_sf_debye_5_e (double @var{x}, gsl_sf_result * @var{result})
53 These routines compute the fifth-order Debye function
54 @math{D_5(x) = (5/x^5) \int_0^x dt (t^5/(e^t - 1))}.
55 @comment Exceptional Return Values: GSL_EDOM, GSL_EUNDRFLW
58 @deftypefun double gsl_sf_debye_6 (double @var{x})
59 @deftypefunx int gsl_sf_debye_6_e (double @var{x}, gsl_sf_result * @var{result})
60 These routines compute the sixth-order Debye function
61 @math{D_6(x) = (6/x^6) \int_0^x dt (t^6/(e^t - 1))}.
62 @comment Exceptional Return Values: GSL_EDOM, GSL_EUNDRFLW