LAPACK 3.11.0
LAPACK: Linear Algebra PACKage
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◆ cla_wwaddw()

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

CLA_WWADDW adds a vector into a doubled-single vector.

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

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

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

Definition at line 80 of file cla_wwaddw.f.

81*
82* -- LAPACK computational routine --
83* -- LAPACK is a software package provided by Univ. of Tennessee, --
84* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
85*
86* .. Scalar Arguments ..
87 INTEGER N
88* ..
89* .. Array Arguments ..
90 COMPLEX X( * ), Y( * ), W( * )
91* ..
92*
93* =====================================================================
94*
95* .. Local Scalars ..
96 COMPLEX S
97 INTEGER I
98* ..
99* .. Executable Statements ..
100*
101 DO 10 i = 1, n
102 s = x(i) + w(i)
103 s = (s + s) - s
104 y(i) = ((x(i) - s) + w(i)) + y(i)
105 x(i) = s
106 10 CONTINUE
107 RETURN
108*
109* End of CLA_WWADDW
110*
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