BESSEL_YN intrinsic function

Standard: F77 F90 F95 F2003 F2008 F2018 Example program

＜Syntax＞

Elemental Form

BESSEL_YN ( N, X )

N : Integer, with non-negative value;
X : Real;

Result : Same type and kind as X.

Transformational Form

BESSEL_YN ( N1, N2, X )

N1 : Integer scalar, with non-negative value;
N2 : Integer scalar, with non-negative value;
X : Real scalar;

Result : Vector of size MAX(N2-N1+1,0) with the same type and kind as X.

＜Semantics＞

For the elemental form, the value of the result is an approximation to the Bessel function of the 2^nd kind, order N, at the point X. Being elemental, the result has the same shape as X or N, whichever is an array, with the operation being applied elementwise. If both X and N are arrays, they must have the same shape.

For the transformational form, the value of the result is an approximation to the Bessel function of the 2^nd kind, orders N1 to N2, at the point X. If N2<N1, the result will be a zero-sized array.