<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> <title>SuperLU: SRC/dgscon.c File Reference</title> <link href="doxygen.css" rel="stylesheet" type="text/css"> <link href="tabs.css" rel="stylesheet" type="text/css"> </head><body> <!-- Generated by Doxygen 1.5.5 --> <div class="navigation" id="top"> <div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="annotated.html"><span>Data Structures</span></a></li> <li class="current"><a href="files.html"><span>Files</span></a></li> </ul> </div> </div> <div class="contents"> <h1>SRC/dgscon.c File Reference</h1>Estimates reciprocal of the condition number of a general matrix. <a href="#_details">More...</a> <p> <code>#include <math.h></code><br> <code>#include "<a class="el" href="slu__ddefs_8h-source.html">slu_ddefs.h</a>"</code><br> <table border="0" cellpadding="0" cellspacing="0"> <tr><td></td></tr> <tr><td colspan="2"><br><h2>Functions</h2></td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="dgscon_8c.html#2c7a4267d306243d3ceb15531522033e">dgscon</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> </table> <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 DGECON. </pre> <hr><h2>Function Documentation</h2> <a class="anchor" name="2c7a4267d306243d3ceb15531522033e"></a><!-- doxytag: member="dgscon.c::dgscon" ref="2c7a4267d306243d3ceb15531522033e" args="(char *norm, SuperMatrix *L, SuperMatrix *U, double anorm, double *rcond, SuperLUStat_t *stat, int *info)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">void dgscon </td> <td>(</td> <td class="paramtype">char * </td> <td class="paramname"> <em>norm</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="structSuperMatrix.html">SuperMatrix</a> * </td> <td class="paramname"> <em>L</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="structSuperMatrix.html">SuperMatrix</a> * </td> <td class="paramname"> <em>U</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">double </td> <td class="paramname"> <em>anorm</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">double * </td> <td class="paramname"> <em>rcond</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="structSuperLUStat__t.html">SuperLUStat_t</a> * </td> <td class="paramname"> <em>stat</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">int * </td> <td class="paramname"> <em>info</em></td><td> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td><td width="100%"></td> </tr> </table> </div> <div class="memdoc"> <p> <pre> Purpose =======</pre><p> <pre> DGSCON 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 DGETRF. *</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="dgstrf_8c.html#65a25ed27f2524e9cbc8f6ce8cd22c38">dgstrf()</a>. Use compressed row subscripts storage for supernodes, i.e., L has types: Stype = SLU_SC, Dtype = SLU_D, 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="dgstrf_8c.html#65a25ed27f2524e9cbc8f6ce8cd22c38">dgstrf()</a>. Use column-wise storage scheme, i.e., U has types: Stype = SLU_NC, Dtype = SLU_D, 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 < 0: if INFO = -i, the i-th argument had an illegal value</pre><p> <pre> ===================================================================== </pre> </div> </div><p> </div> <hr size="1"><address style="text-align: right;"><small>Generated on Thu Aug 25 13:43:49 2011 for SuperLU by <a href="http://www.doxygen.org/index.html"> <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.5 </small></address> </body> </html>