LAPACK 3.12.0 LAPACK: Linear Algebra PACKage
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◆ scasum()

 real function scasum ( integer n, complex, dimension(*) cx, integer incx )

SCASUM

Purpose:
```    SCASUM takes the sum of the (|Re(.)| + |Im(.)|)'s of a complex vector and
returns a single precision result.```
Parameters
 [in] N ``` N is INTEGER number of elements in input vector(s)``` [in,out] CX ` CX is COMPLEX array, dimension ( 1 + ( N - 1 )*abs( INCX ) )` [in] INCX ``` INCX is INTEGER storage spacing between elements of SX```
Further Details:
```     jack dongarra, linpack, 3/11/78.
modified 3/93 to return if incx .le. 0.
modified 12/3/93, array(1) declarations changed to array(*)```

Definition at line 71 of file scasum.f.

72*
73* -- Reference BLAS level1 routine --
74* -- Reference BLAS is a software package provided by Univ. of Tennessee, --
75* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
76*
77* .. Scalar Arguments ..
78 INTEGER INCX,N
79* ..
80* .. Array Arguments ..
81 COMPLEX CX(*)
82* ..
83*
84* =====================================================================
85*
86* .. Local Scalars ..
87 REAL STEMP
88 INTEGER I,NINCX
89* ..
90* .. Intrinsic Functions ..
91 INTRINSIC abs,aimag,real
92* ..
93 scasum = 0.0e0
94 stemp = 0.0e0
95 IF (n.LE.0 .OR. incx.LE.0) RETURN
96 IF (incx.EQ.1) THEN
97*
98* code for increment equal to 1
99*
100 DO i = 1,n
101 stemp = stemp + abs(real(cx(i))) + abs(aimag(cx(i)))
102 END DO
103 ELSE
104*
105* code for increment not equal to 1
106*
107 nincx = n*incx
108 DO i = 1,nincx,incx
109 stemp = stemp + abs(real(cx(i))) + abs(aimag(cx(i)))
110 END DO
111 END IF
112 scasum = stemp
113 RETURN
114*
115* End of SCASUM
116*
real function scasum(n, cx, incx)
SCASUM
Definition scasum.f:72
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