isamax.f.html

来自「famous linear algebra library (LAPACK) p」· HTML 代码 · 共 76 行

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<pre>
      INTEGER FUNCTION <a name="ISAMAX.1"></a><a href="isamax.f.html#ISAMAX.1">ISAMAX</a>(N,SX,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>      REAL SX(*)
<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, linpack, 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>      REAL SMAX
      INTEGER I,IX
<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>      <a name="ISAMAX.25"></a><a href="isamax.f.html#ISAMAX.1">ISAMAX</a> = 0
      IF (N.LT.1 .OR. INCX.LE.0) RETURN
      <a name="ISAMAX.27"></a><a href="isamax.f.html#ISAMAX.1">ISAMAX</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 = ABS(SX(1))
      IX = IX + INCX
      DO 10 I = 2,N
          IF (ABS(SX(IX)).LE.SMAX) GO TO 5
          <a name="ISAMAX.38"></a><a href="isamax.f.html#ISAMAX.1">ISAMAX</a> = I
          SMAX = ABS(SX(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 = ABS(SX(1))
      DO 30 I = 2,N
          IF (ABS(SX(I)).LE.SMAX) GO TO 30
          <a name="ISAMAX.49"></a><a href="isamax.f.html#ISAMAX.1">ISAMAX</a> = I
          SMAX = ABS(SX(I))
   30 CONTINUE
      RETURN
      END

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