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i1e

Modified Bessel function of order one, exponentially scaled.

SYNOPSIS:

double x, y, i1e();
y = i1e(x);

DESCRIPTION:

Returns the exponentially scaled modified Bessel function of order one of the argument.
The function is defined as i1(x) = -i exp(-|x|) j1(ix).

ACCURACY:
                      Relative error:
arithmetic   domain     # trials      peak         rms
    IEEE      0, 30       30000       2.0e-15     2.0e-16