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

842 HP MLIB User’s Guide
vsacosh, vdacosh The arc hyperbolic cosine of the elements of a vector
Name vsacosh, vdacosh
The arc hyperbolic cosine of the elements of a vector
Purpose vsacosh and vdacosh calculate the arc hyperbolic cosine function of vector
elements:
y(i) = acosh(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 vsacosh(n, a, y)
INTEGER, INTENT(IN) :: n
REAL (KIND=4), DIMENSION(n), INTENT(IN) :: a
REAL (KIND=4), DIMENSION(n), INTENT(OUT):: y
SUBROUTINE vdacosh(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.