# Exponential Integrals and Related Functions

## EXPONENTIAL INTEGRALS AND RELATED FUNCTIONS

ROUTINE DESCRIPTION
EI Evaluates the exponential integral for arguments greater than zero and the Cauchy principal value for arguments less than zero.
E1 Evaluates the exponential integral for arguments greater than zero and the Cauchy principal value of the integral for arguments less than zero.
ENE Evaluates the exponential integral of integer order for arguments greater than zero scaled by EXP(X).
ALI Evaluates the logarithmic integral.
SI Evaluates the sine integral.
CI Evaluates the cosine integral.
CIN Evaluates a function closely related to the cosine integral.
SHI Evaluates the hyperbolic sine integral.
CHI Evaluates the hyperbolic cosine integral.
CINH Evaluates a function closely related to the hyperbolic cosine integral.