BSK1E
This function evaluates the exponentially scaled modified Bessel function of the second kind of order one.
Function Return Value
BSK1E — Function value. (Output)
Required Arguments
X — Argument for which the function value is desired. (Input)
FORTRAN 90 Interface
Generic: BSK1E (X)
Specific: The specific interface names are S_BSK1E and D_BSK1E.
FORTRAN 77 Interface
Single: BSK1E (X)
Double: The double precision function name is DBSK1E.
Description
Function
BSK1E computes e
xK1(
x). For the definition of the Bessel function
K1(
x), see
BSK1. The answer
BSK1E = e
xK1(
x)
≈ 1/
x overflows if
x is too close to zero.
Example
In this example, BSK1E(0.5) is computed and printed.
USE BSK1E_INT
USE UMACH_INT
IMPLICIT NONE
! Declare variables
INTEGER NOUT
REAL VALUE, X
! Compute
X = 0.5
VALUE = BSK1E(X)
! Print the results
CALL UMACH (2, NOUT)
WRITE (NOUT,99999) X, VALUE
99999 FORMAT (' BSK1E(', F6.3, ') = ', F6.3)
END
Output
BSK1E( 0.500) = 2.731
Published date: 03/19/2020
Last modified date: 03/19/2020
