LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ zla_wwaddw()

subroutine zla_wwaddw ( integer  N,
complex*16, dimension( * )  X,
complex*16, dimension( * )  Y,
complex*16, dimension( * )  W 
)

ZLA_WWADDW adds a vector into a doubled-single vector.

Download ZLA_WWADDW + dependencies [TGZ] [ZIP] [TXT]

Purpose:
    ZLA_WWADDW adds a vector W into a doubled-single vector (X, Y).

    This works for all extant IBM's hex and binary floating point
    arithmetics, but not for decimal.
Parameters
[in]N
          N is INTEGER
            The length of vectors X, Y, and W.
[in,out]X
          X is COMPLEX*16 array, dimension (N)
            The first part of the doubled-single accumulation vector.
[in,out]Y
          Y is COMPLEX*16 array, dimension (N)
            The second part of the doubled-single accumulation vector.
[in]W
          W is COMPLEX*16 array, dimension (N)
            The vector to be added.
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date
December 2016

Definition at line 83 of file zla_wwaddw.f.

83 *
84 * -- LAPACK computational routine (version 3.7.0) --
85 * -- LAPACK is a software package provided by Univ. of Tennessee, --
86 * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
87 * December 2016
88 *
89 * .. Scalar Arguments ..
90  INTEGER n
91 * ..
92 * .. Array Arguments ..
93  COMPLEX*16 x( * ), y( * ), w( * )
94 * ..
95 *
96 * =====================================================================
97 *
98 * .. Local Scalars ..
99  COMPLEX*16 s
100  INTEGER i
101 * ..
102 * .. Executable Statements ..
103  DO 10 i = 1, n
104  s = x(i) + w(i)
105  s = (s + s) - s
106  y(i) = ((x(i) - s) + w(i)) + y(i)
107  x(i) = s
108  10 CONTINUE
109  RETURN
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