48 lines
1.1 KiB
FortranFixed
48 lines
1.1 KiB
FortranFixed
REAL FUNCTION SCASUM(N,CX,INCX)
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* .. Scalar Arguments ..
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INTEGER INCX,N
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* ..
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* .. Array Arguments ..
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COMPLEX CX(*)
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* ..
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*
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* Purpose
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* =======
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*
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* takes the sum of the absolute values of a complex vector and
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* returns a single precision result.
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* jack dongarra, linpack, 3/11/78.
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* modified 3/93 to return if incx .le. 0.
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* modified 12/3/93, array(1) declarations changed to array(*)
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*
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*
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* .. Local Scalars ..
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REAL STEMP
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INTEGER I,NINCX
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* ..
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* .. Intrinsic Functions ..
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INTRINSIC ABS,AIMAG,REAL
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* ..
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SCASUM = 0.0e0
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STEMP = 0.0e0
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IF (N.LE.0 .OR. INCX.LE.0) RETURN
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IF (INCX.EQ.1) GO TO 20
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*
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* code for increment not equal to 1
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*
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NINCX = N*INCX
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DO 10 I = 1,NINCX,INCX
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STEMP = STEMP + ABS(REAL(CX(I))) + ABS(AIMAG(CX(I)))
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10 CONTINUE
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SCASUM = STEMP
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RETURN
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*
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* code for increment equal to 1
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*
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20 DO 30 I = 1,N
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STEMP = STEMP + ABS(REAL(CX(I))) + ABS(AIMAG(CX(I)))
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30 CONTINUE
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SCASUM = STEMP
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RETURN
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END
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