BESSEL_Y1 (The GNU Fortran Compiler)

### 8.48 `BESSEL_Y1` — Bessel function of the second kind of order 1 ¶

Synopsis:

  `RESULT = BESSEL_Y1(X)`

Description:

  `BESSEL_Y1(X)` computes the Bessel function of the second kind of order 1 of X. This function is available under the name `BESY1` as a GNU extension.

Class:

  Elemental function

Arguments:

  X | The type shall be `REAL`.

Return value:

  The return value is of type `REAL`. It has the same kind as X.

Example:

      program test_besy1
        real(8) :: x = 1.0_8
        x = bessel_y1(x)
      end program test_besy1

Specific names:

  Name | Argument | Return type | Standard
  --- | --- | --- | ---
  `DBESY1(X)` | `REAL(8) X` | `REAL(8)` | GNU extension

Standard:

  Fortran 2008 and later