/usr/include/ITK-4.5/vnl/vnl_bessel.h is in libinsighttoolkit4-dev 4.5.0-3.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | // This is core/vnl/vnl_bessel.h
#ifndef vnl_bessel_h_
#define vnl_bessel_h_
//:
// \file
// \brief Bessel functions of the first kind
// \author Tim Cootes
#include <vnl/vnl_vector.h>
//: Returns J_n(x), the value of the Bessel function of order n at x
// Bessel function of the first kind of order n
double vnl_bessel(unsigned n, double x);
//: Returns J_0(x), the value of the Bessel function of order 0 at x
// Bessel function of the first kind of order zero
double vnl_bessel0(double x);
//: Compute Bessel functions of first kind up to order n_max
// On exit, J[i] = J_i(x) for i=0..n_max
void vnl_bessel(unsigned n_max, double x, vnl_vector<double>& J);
#endif // vnl_bessel_h_
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