PURPOSE: to calculate the exponential integral with complex limits.
METHOD: The exponential integral is defined as:
where the integration path is the straight line from V1 to V2 on the complex v plane and
The integration path is a horizontal line in the w plane or an inclined straight line from V1 to V2 in the v plane. The integer n is zero unless this path intersects the negative real v asix at a point between V1 and V2. When there is such an intersection,
a) n = 1 if Im(V1) > Im(V2)
b) n = -1 if Im(V1) < Im(V2)
is calculated below statement 12.
CALLS TO: NONE
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Last modified on: 3 Nov 2007