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

870 HP MLIB User’s Guide

vstanh, vdtanh The hyperbolic tangent of the elements of a vector

Name vstanh, vdtanh

The hyperbolic tangent of the elements of a vector

Purpose vstanh and vdtanh calculate the hyperbolic tangent function of vector

elements:

y(i) = tanh(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 vstanh(n, a, y)

INTEGER, INTENT(IN) :: n

REAL (KIND=4), DIMENSION(n), INTENT(IN) :: a

REAL (KIND=4), DIMENSION(n), INTENT(OUT):: y

SUBROUTINE vdstanh(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.