Given a complex number Z = (XI,YI), this subroutine computes
the value of the Faddeeva function W(Z) = exp(-Z* 2)erfc(-I*Z),
where erfc is the complex complementary error function and I
is the imaginary unit.

Type | Intent | Optional | Attributes | Name | ||
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real | :: | XI |
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real | :: | YI |
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real | :: | U |
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real | :: | V |
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logical | :: | FLAG |