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<h1>SRC/zgscon.c File Reference</h1>Estimates reciprocal of the condition number of a general matrix. <a href="#_details">More...</a>
<p>
<code>#include &lt;math.h&gt;</code><br>
<code>#include &quot;<a class="el" href="slu__zdefs_8h-source.html">slu_zdefs.h</a>&quot;</code><br>
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<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="zgscon_8c.html#6be8d109849b5406d8256de2419caf2e">zgscon</a> (char *norm, <a class="el" href="structSuperMatrix.html">SuperMatrix</a> *L, <a class="el" href="structSuperMatrix.html">SuperMatrix</a> *U, double anorm, double *rcond, <a class="el" href="structSuperLUStat__t.html">SuperLUStat_t</a> *stat, int *info)</td></tr>

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<hr><a name="_details"></a><h2>Detailed Description</h2>
<pre>
 -- SuperLU routine (version 3.0) --
 Univ. of California Berkeley, Xerox Palo Alto Research Center,
 and Lawrence Berkeley National Lab.
 October 15, 2003</pre><p>
<pre> Modified from lapack routines ZGECON.
 </pre> <hr><h2>Function Documentation</h2>
<a class="anchor" name="6be8d109849b5406d8256de2419caf2e"></a><!-- doxytag: member="zgscon.c::zgscon" ref="6be8d109849b5406d8256de2419caf2e" args="(char *norm, SuperMatrix *L, SuperMatrix *U, double anorm, double *rcond, SuperLUStat_t *stat, int *info)" -->
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          <td class="memname">void zgscon           </td>
          <td>(</td>
          <td class="paramtype">char *&nbsp;</td>
          <td class="paramname"> <em>norm</em>, </td>
        </tr>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="structSuperMatrix.html">SuperMatrix</a> *&nbsp;</td>
          <td class="paramname"> <em>L</em>, </td>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="structSuperMatrix.html">SuperMatrix</a> *&nbsp;</td>
          <td class="paramname"> <em>U</em>, </td>
        </tr>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">double&nbsp;</td>
          <td class="paramname"> <em>anorm</em>, </td>
        </tr>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">double *&nbsp;</td>
          <td class="paramname"> <em>rcond</em>, </td>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="structSuperLUStat__t.html">SuperLUStat_t</a> *&nbsp;</td>
          <td class="paramname"> <em>stat</em>, </td>
        </tr>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int *&nbsp;</td>
          <td class="paramname"> <em>info</em></td><td>&nbsp;</td>
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          <td>)</td>
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<p>
<pre>
   Purpose   
   =======</pre><p>
<pre>   ZGSCON estimates the reciprocal of the condition number of a general 
   real matrix A, in either the 1-norm or the infinity-norm, using   
   the LU factorization computed by ZGETRF.   *</pre><p>
<pre>   An estimate is obtained for norm(inv(A)), and the reciprocal of the   
   condition number is computed as   
      RCOND = 1 / ( norm(A) * norm(inv(A)) ).</pre><p>
<pre>   See <a class="el" href="supermatrix_8h.html" title="Defines matrix types.">supermatrix.h</a> for the definition of 'SuperMatrix' structure.</pre><p>
<pre>   Arguments   
   =========</pre><p>
<pre>    NORM    (input) char*
            Specifies whether the 1-norm condition number or the   
            infinity-norm condition number is required:   
            = '1' or 'O':  1-norm;   
            = 'I':         Infinity-norm.</pre><p>
<pre>    L       (input) SuperMatrix*
            The factor L from the factorization Pr*A*Pc=L*U as computed by
            <a class="el" href="slu__zdefs_8h.html#58d722a16a6f114a94cb2f59c8b08df4">zgstrf()</a>. Use compressed row subscripts storage for supernodes,
            i.e., L has types: Stype = SLU_SC, Dtype = SLU_Z, Mtype = SLU_TRLU.</pre><p>
<pre>    U       (input) SuperMatrix*
            The factor U from the factorization Pr*A*Pc=L*U as computed by
            <a class="el" href="slu__zdefs_8h.html#58d722a16a6f114a94cb2f59c8b08df4">zgstrf()</a>. Use column-wise storage scheme, i.e., U has types:
            Stype = SLU_NC, Dtype = SLU_Z, Mtype = SLU_TRU.</pre><p>
<pre>    ANORM   (input) double
            If NORM = '1' or 'O', the 1-norm of the original matrix A.   
            If NORM = 'I', the infinity-norm of the original matrix A.</pre><p>
<pre>    RCOND   (output) double*
           The reciprocal of the condition number of the matrix A,   
           computed as RCOND = 1/(norm(A) * norm(inv(A))).</pre><p>
<pre>    INFO    (output) int*
           = 0:  successful exit   
           &lt; 0:  if INFO = -i, the i-th argument had an illegal value</pre><p>
<pre>    ===================================================================== 
 </pre> 
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