scsum1.f.html

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      REAL             FUNCTION <a name="SCSUM1.1"></a><a href="scsum1.f.html#SCSUM1.1">SCSUM1</a>( N, CX, INCX )
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  -- LAPACK auxiliary routine (version 3.1) --
</span><span class="comment">*</span><span class="comment">     Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
</span><span class="comment">*</span><span class="comment">     November 2006
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     .. Scalar Arguments ..
</span>      INTEGER            INCX, N
<span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">     .. Array Arguments ..
</span>      COMPLEX            CX( * )
<span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  Purpose
</span><span class="comment">*</span><span class="comment">  =======
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  <a name="SCSUM1.17"></a><a href="scsum1.f.html#SCSUM1.1">SCSUM1</a> takes the sum of the absolute values of a complex
</span><span class="comment">*</span><span class="comment">  vector and returns a single precision result.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  Based on SCASUM from the Level 1 BLAS.
</span><span class="comment">*</span><span class="comment">  The change is to use the 'genuine' absolute value.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  Contributed by Nick Higham for use with <a name="CLACON.23"></a><a href="clacon.f.html#CLACON.1">CLACON</a>.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  Arguments
</span><span class="comment">*</span><span class="comment">  =========
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  N       (input) INTEGER
</span><span class="comment">*</span><span class="comment">          The number of elements in the vector CX.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  CX      (input) COMPLEX array, dimension (N)
</span><span class="comment">*</span><span class="comment">          The vector whose elements will be summed.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  INCX    (input) INTEGER
</span><span class="comment">*</span><span class="comment">          The spacing between successive values of CX.  INCX &gt; 0.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  =====================================================================
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     .. Local Scalars ..
</span>      INTEGER            I, NINCX
      REAL               STEMP
<span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">     .. Intrinsic Functions ..
</span>      INTRINSIC          ABS
<span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">     .. Executable Statements ..
</span><span class="comment">*</span><span class="comment">
</span>      <a name="SCSUM1.48"></a><a href="scsum1.f.html#SCSUM1.1">SCSUM1</a> = 0.0E0
      STEMP = 0.0E0
      IF( N.LE.0 )
     $   RETURN
      IF( INCX.EQ.1 )
     $   GO TO 20
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     CODE FOR INCREMENT NOT EQUAL TO 1
</span><span class="comment">*</span><span class="comment">
</span>      NINCX = N*INCX
      DO 10 I = 1, NINCX, INCX
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">        NEXT LINE MODIFIED.
</span><span class="comment">*</span><span class="comment">
</span>         STEMP = STEMP + ABS( CX( I ) )
   10 CONTINUE
      <a name="SCSUM1.64"></a><a href="scsum1.f.html#SCSUM1.1">SCSUM1</a> = STEMP
      RETURN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     CODE FOR INCREMENT EQUAL TO 1
</span><span class="comment">*</span><span class="comment">
</span>   20 CONTINUE
      DO 30 I = 1, N
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">        NEXT LINE MODIFIED.
</span><span class="comment">*</span><span class="comment">
</span>         STEMP = STEMP + ABS( CX( I ) )
   30 CONTINUE
      <a name="SCSUM1.76"></a><a href="scsum1.f.html#SCSUM1.1">SCSUM1</a> = STEMP
      RETURN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     End of <a name="SCSUM1.79"></a><a href="scsum1.f.html#SCSUM1.1">SCSUM1</a>
</span><span class="comment">*</span><span class="comment">
</span>      END

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