cylBessel_i0

Modified Bessel function of order zero

Returns modified Bessel function of order zero of the argument.

The function is defined as i0(x) = j0( ix ).

The range is partitioned into the two intervals [0,8] and (8, infinity). Chebyshev polynomial expansions are employed in each interval.

double
cylBessel_i0
(
double x
)

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