besselJ

double besselJ(double x, double alpha)
double
besselJ
(
double x
,
double alpha
)
double besselJ(double x, double alpha, double[] b)
void besselJ(double x, double alpha, double[] b, ptrdiff_t ncalc)

Examples

assert(std.math.approxEqual(besselJ(2, 1), 0.5767248077568733872024482422691));
assert(std.math.approxEqual(besselJ(20, 1), 0.066833124175850045578992974193));
assert(std.math.approxEqual(besselJ(1, 1.2), 0.351884));

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Source

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bessel functions