Exponential Integral
Function:
double
gsl_sf_expint_E1
(double
x
)
Function:
int
gsl_sf_expint_E1_e
(double
x
, gsl_sf_result *
result
)
These routines compute the exponential integral E_1(x),
E_1(x) := Re \int_1^\infty dt \exp(-xt)/t.
Function:
double
gsl_sf_expint_E2
(double
x
)
Function:
int
gsl_sf_expint_E2_e
(double
x
, gsl_sf_result *
result
)
These routines compute the second-order exponential integral E_2(x),
E_2(x) := \Re \int_1^\infty dt \exp(-xt)/t^2.