dzasum.f.html

来自「famous linear algebra library (LAPACK) p」· HTML 代码 · 共 71 行

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<pre>
      DOUBLE PRECISION FUNCTION <a name="DZASUM.1"></a><a href="dzasum.f.html#DZASUM.1">DZASUM</a>(N,ZX,INCX)
<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>      DOUBLE COMPLEX ZX(*)
<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">     takes the sum of the absolute values.
</span><span class="comment">*</span><span class="comment">     jack dongarra, 3/11/78.
</span><span class="comment">*</span><span class="comment">     modified 3/93 to return if incx .le. 0.
</span><span class="comment">*</span><span class="comment">     modified 12/3/93, array(1) declarations changed to array(*)
</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>      DOUBLE PRECISION STEMP
      INTEGER I,IX
<span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">     .. External Functions ..
</span>      DOUBLE PRECISION <a name="DCABS1.23"></a><a href="dcabs1.f.html#DCABS1.1">DCABS1</a>
      EXTERNAL <a name="DCABS1.24"></a><a href="dcabs1.f.html#DCABS1.1">DCABS1</a>
<span class="comment">*</span><span class="comment">     ..
</span>      <a name="DZASUM.26"></a><a href="dzasum.f.html#DZASUM.1">DZASUM</a> = 0.0d0
      STEMP = 0.0d0
      IF (N.LE.0 .OR. INCX.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>      IX = 1
      DO 10 I = 1,N
          STEMP = STEMP + <a name="DCABS1.35"></a><a href="dcabs1.f.html#DCABS1.1">DCABS1</a>(ZX(IX))
          IX = IX + INCX
   10 CONTINUE
      <a name="DZASUM.38"></a><a href="dzasum.f.html#DZASUM.1">DZASUM</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 DO 30 I = 1,N
          STEMP = STEMP + <a name="DCABS1.44"></a><a href="dcabs1.f.html#DCABS1.1">DCABS1</a>(ZX(I))
   30 CONTINUE
      <a name="DZASUM.46"></a><a href="dzasum.f.html#DZASUM.1">DZASUM</a> = STEMP
      RETURN
      END

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