LAPACK 3.11.0 LAPACK: Linear Algebra PACKage
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## ◆ sla_wwaddw()

 subroutine sla_wwaddw ( integer N, real, dimension( * ) X, real, dimension( * ) Y, real, dimension( * ) W )

SLA_WWADDW adds a vector into a doubled-single vector.

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

Purpose:
```    SLA_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 REAL array, dimension (N) The first part of the doubled-single accumulation vector.``` [in,out] Y ``` Y is REAL array, dimension (N) The second part of the doubled-single accumulation vector.``` [in] W ``` W is REAL array, dimension (N) The vector to be added.```

Definition at line 80 of file sla_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 REAL X( * ), Y( * ), W( * )
91* ..
92*
93* =====================================================================
94*
95* .. Local Scalars ..
96 REAL 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 SLA_WWADDW
110*
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