Y = expint(X)
Y = expint(X)
evaluates the exponential integral
for each element of X
.
X
in the range [-38,2], expint
uses a series expansion representation (equation 5.1.10 in [1]):
For all other elements of X
, expint
uses a continued fraction representation (equation 5.1.22 in [1]):
(c) Copyright 1994 by The MathWorks, Inc.