zlag2c.f.html

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      SUBROUTINE <a name="ZLAG2C.1"></a><a href="zlag2c.f.html#ZLAG2C.1">ZLAG2C</a>( M, N, A, LDA, SA, LDSA, INFO)
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  -- LAPACK PROTOTYPE auxilary routine (version 3.1.1) --
</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">     January 2007
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">     .. WARNING: PROTOTYPE ..
</span><span class="comment">*</span><span class="comment">     This is an LAPACK PROTOTYPE routine which means that the
</span><span class="comment">*</span><span class="comment">     interface of this routine is likely to be changed in the future
</span><span class="comment">*</span><span class="comment">     based on community feedback.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">     .. Scalar Arguments ..
</span>      INTEGER INFO,LDA,LDSA,M,N
<span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">     .. Array Arguments ..
</span>      COMPLEX SA(LDSA,*)
      COMPLEX*16 A(LDA,*)
<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="ZLAG2C.25"></a><a href="zlag2c.f.html#ZLAG2C.1">ZLAG2C</a> converts a DOUBLE PRECISION COMPLEX matrix, SA, to a SINGLE
</span><span class="comment">*</span><span class="comment">  PRECISION COMPLEX matrix, A.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  RMAX is the overflow for the SINGLE PRECISION arithmetic
</span><span class="comment">*</span><span class="comment">  <a name="ZLAG2C.29"></a><a href="zlag2c.f.html#ZLAG2C.1">ZLAG2C</a> checks that all the entries of A are between -RMAX and
</span><span class="comment">*</span><span class="comment">  RMAX. If not the convertion is aborted and a flag is raised.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  This is a helper routine so there is no argument checking.
</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">  M       (input) INTEGER
</span><span class="comment">*</span><span class="comment">          The number of lines of the matrix A.  M &gt;= 0.
</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 columns of the matrix A.  N &gt;= 0.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  A       (input) DOUBLE PRECISION array, dimension (LDA,N)
</span><span class="comment">*</span><span class="comment">          On entry, the M-by-N coefficient matrix A.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  LDA     (input) INTEGER
</span><span class="comment">*</span><span class="comment">          The leading dimension of the array A.  LDA &gt;= max(1,M).
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  SA      (output) REAL array, dimension (LDSA,N)
</span><span class="comment">*</span><span class="comment">          On exit, if INFO=0, the M-by-N coefficient matrix SA.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  LDSA    (input) INTEGER
</span><span class="comment">*</span><span class="comment">          The leading dimension of the array SA.  LDSA &gt;= max(1,M).
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  INFO    (output) INTEGER
</span><span class="comment">*</span><span class="comment">          = 0:  successful exit
</span><span class="comment">*</span><span class="comment">          &gt; 0:  if INFO = k, the (i,j) entry of the matrix A has
</span><span class="comment">*</span><span class="comment">                overflowed when moving from DOUBLE PRECISION to SINGLE
</span><span class="comment">*</span><span class="comment">                k is given by k = (i-1)*LDA+j
</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,J
      DOUBLE PRECISION RMAX
<span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">     .. Intrinsic Functions ..
</span>      INTRINSIC DBLE, DIMAG
<span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">     .. External Functions ..
</span>      REAL <a name="SLAMCH.71"></a><a href="slamch.f.html#SLAMCH.1">SLAMCH</a>
      EXTERNAL <a name="SLAMCH.72"></a><a href="slamch.f.html#SLAMCH.1">SLAMCH</a>
<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>      RMAX = <a name="SLAMCH.76"></a><a href="slamch.f.html#SLAMCH.1">SLAMCH</a>(<span class="string">'O'</span>)
      DO 20 J = 1,N
          DO 30 I = 1,M
              IF  ((DBLE(A(I,J)).LT.-RMAX) .OR. (DBLE(A(I,J)).GT.RMAX)
     $      .OR. (DIMAG(A(I,J)).LT.-RMAX) .OR. (DIMAG(A(I,J)).GT.RMAX))
     $      THEN
                  INFO = (I-1)*LDA + J
                  GO TO 10
              END IF
              SA(I,J) = A(I,J)
   30     CONTINUE
   20 CONTINUE
   10 CONTINUE
      RETURN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     End of <a name="ZLAG2C.91"></a><a href="zlag2c.f.html#ZLAG2C.1">ZLAG2C</a>
</span><span class="comment">*</span><span class="comment">
</span>      END

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