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bessel_j1 (Rev #3, changes)

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Description

bessel_j1(x) computes the Bessel function of the first kind of order 1 of x.

Standard

Fortran 2008 and later

Class

Elemental function

Syntax

result = bessel_j1(x)

Arguments

• x - The type shall be real(削除) , (削除ここまで)(追記) . (追記ここまで)(削除) and (削除ここまで)(削除) it (削除ここまで)(削除) shall (削除ここまで)(削除) be (削除ここまで)(削除) scalar. (削除ここまで)

Return value

The return value is of type real and(削除) it (削除ここまで) lies in the range- 0.5818... \\leq Bessel (0,x) \\leq 0.5818 . It has the same kind as x.

Example

program test_besj1
 real(8) :: x = 1.0_8
 x = bessel_j1(x)
end program test_besj1