## BESSEL_J0 intrinsic function

### Standard: F77 F90 F95 F2003 F2008 F2018 Example program

### ＜Syntax＞

BESSEL_J0 ( X )

X : Real;

Result : Same type and kind as X.

### ＜Semantics＞

The value of the result is an approximation to the Bessel function of the 1^{st} kind, order 0, at the point X.
Like many intrinsic functions, this is **elemental**; the result has the same shape as X, with the operation being applied elementwise.

### ＜Related＞

BESSEL_J1 intrinsic function, BESSEL_JN intrinsic function, BESSEL_Y0 intrinsic function, BESSEL_Y1 intrinsic function, BESSEL_YN intrinsic function