izamax.f.html

来自「famous linear algebra library (LAPACK) p」· HTML 代码 · 共 77 行

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<pre>
      INTEGER FUNCTION <a name="IZAMAX.1"></a><a href="izamax.f.html#IZAMAX.1">IZAMAX</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">     finds the index of element having max. absolute value.
</span><span class="comment">*</span><span class="comment">     jack dongarra, 1/15/85.
</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 SMAX
      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="IZAMAX.26"></a><a href="izamax.f.html#IZAMAX.1">IZAMAX</a> = 0
      IF (N.LT.1 .OR. INCX.LE.0) RETURN
      <a name="IZAMAX.28"></a><a href="izamax.f.html#IZAMAX.1">IZAMAX</a> = 1
      IF (N.EQ.1) 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
      SMAX = <a name="DCABS1.35"></a><a href="dcabs1.f.html#DCABS1.1">DCABS1</a>(ZX(1))
      IX = IX + INCX
      DO 10 I = 2,N
          IF (<a name="DCABS1.38"></a><a href="dcabs1.f.html#DCABS1.1">DCABS1</a>(ZX(IX)).LE.SMAX) GO TO 5
          <a name="IZAMAX.39"></a><a href="izamax.f.html#IZAMAX.1">IZAMAX</a> = I
          SMAX = <a name="DCABS1.40"></a><a href="dcabs1.f.html#DCABS1.1">DCABS1</a>(ZX(IX))
    5     IX = IX + INCX
   10 CONTINUE
      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 SMAX = <a name="DCABS1.47"></a><a href="dcabs1.f.html#DCABS1.1">DCABS1</a>(ZX(1))
      DO 30 I = 2,N
          IF (<a name="DCABS1.49"></a><a href="dcabs1.f.html#DCABS1.1">DCABS1</a>(ZX(I)).LE.SMAX) GO TO 30
          <a name="IZAMAX.50"></a><a href="izamax.f.html#IZAMAX.1">IZAMAX</a> = I
          SMAX = <a name="DCABS1.51"></a><a href="dcabs1.f.html#DCABS1.1">DCABS1</a>(ZX(I))
   30 CONTINUE
      RETURN
      END

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