| Pré. | Proc. |
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