# scipy.special.it2j0y0

scipy.special.it2j0y0(x, out=None) = <ufunc 'it2j0y0'>

  Integrals related to Bessel functions of the first kind of order 0.

  Computes the integrals

  \[\begin{split}\int_0^x \frac{1 - J_0(t)}{t} dt \\ \int_x^\infty \frac{Y_0(t)}{t} dt.\end{split}\]

  For more on \(J_0\) and \(Y_0\) see `j0` and `y0`.

  Parameters:
    x array_like

      Values at which to evaluate the integrals.

    out tuple of ndarrays, optional

      Optional output arrays for the function results.

  Returns:
    ij0 scalar or ndarray

      The integral for `j0`

    iy0 scalar or ndarray

      The integral for `y0`

  References

  [1]

  S. Zhang and J.M. Jin, “Computation of Special Functions”, Wiley 1996

  Examples

  Evaluate the functions at one point.

      >>> from scipy.special import it2j0y0
      >>> int_j, int_y = it2j0y0(1.)
      >>> int_j, int_y
      (0.12116524699506871, 0.39527290169929336)

  Evaluate the functions at several points.

      >>> import numpy as np
      >>> points = np.array([0.5, 1.5, 3.])
      >>> int_j, int_y = it2j0y0(points)
      >>> int_j, int_y
      (array([0.03100699, 0.26227724, 0.85614669]),
       array([ 0.26968854,  0.29769696, -0.02987272]))

  Plot the functions from 0 to 10.

      >>> import matplotlib.pyplot as plt
      >>> fig, ax = plt.subplots()
      >>> x = np.linspace(0., 10., 1000)
      >>> int_j, int_y = it2j0y0(x)
      >>> ax.plot(x, int_j, label=r"$\int_0^x \frac{1-J_0(t)}{t}\,dt$")
      >>> ax.plot(x, int_y, label=r"$\int_x^{\infty} \frac{Y_0(t)}{t}\,dt$")
      >>> ax.legend()
      >>> ax.set_ylim(-2.5, 2.5)
      >>> plt.show()