Module expint 

Constants

EXPINT_TABLE_ORDERS

How many orders the runtime-order expint has precomputed constants for. Past this the per-step scale is a division and the threshold a bisection, per call.

Traits

ExpIntConsts

Functions

expint_double

$E_n(x)$ only, for a runtime order. See expint_double_primal.

expint_double_n

$E_N(x)$ only. See expint_double_primal_n for the shape of the computation.

expint_double_primal

The runtime-order twin of expint_double_primal_n.

expint_double_primal_n

$E_N(x)$ together with the adjacent lower order $E_{N-1}(x)$, which is $-E_N'(x)$ by differentiation under the integral sign.