HP MLIB User's Guide Vol. 2 7th Ed.

Chapter 12 VMATH 847
The arc hyperbolic tangent of the elements of a vector vsatanh, vdatanh
Name vsatanh, vdatanh
The arc hyperbolic tangent of the elements of a vector
Purpose vsatanh and vdatanh calculate the arc hyperbolic tangent function of vector
elements:
y(i) = atanh(a(i)), for 1 <= i <= n
Usage The Fortran include file math.fi declares interfaces for these subroutines,
suitable for both VMATH and VMATH8. The interfaces are compatible with
Intel’s MKL VML (Vector Math Library).
SUBROUTINE vsatanh(n, a, y)
INTEGER, INTENT(IN) :: n
REAL (KIND=4), DIMENSION(n), INTENT(IN) :: a
REAL (KIND=4), DIMENSION(n), INTENT(OUT):: y
SUBROUTINE vdatanh(n, a, y)
INTEGER, INTENT(IN) :: n
REAL (KIND=8), DIMENSION(n), INTENT(IN) :: a
REAL (KIND=8), DIMENSION(n), INTENT(OUT):: y
Input n Number of elements to be calculated.
a Array of length at least n, specifying the input vector.
Output y Array of length at least n specifying the output vector.