dgsequ_8c.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>SuperLU: SRC/dgsequ.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 1.4.6 --><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 id="current"><a href="files.html"><span>Files</span></a></li> </ul></div><div class="tabs"> <ul> <li><a href="files.html"><span>File List</span></a></li> <li><a href="globals.html"><span>Globals</span></a></li> </ul></div><h1>SRC/dgsequ.c File Reference</h1>Computes row and column scalings. <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="dgsequ_8c.html#af22b247cc134fb0ba90285e84ccebb4">dgsequ</a> (<a class="el" href="structSuperMatrix.html">SuperMatrix</a> *A, double *r, double *c, double *rowcnd, double *colcnd, double *amax, int *info)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Driver related. <a href="#af22b247cc134fb0ba90285e84ccebb4"></a><br></td></tr></table><hr><a name="_details"></a><h2>Detailed Description</h2><pre> -- SuperLU routine (version 2.0) -- Univ. of California Berkeley, Xerox Palo Alto Research Center, and Lawrence Berkeley National Lab. November 15, 1997</pre><p><pre> Modified from LAPACK routine DGEEQU </pre> <hr><h2>Function Documentation</h2><a class="anchor" name="af22b247cc134fb0ba90285e84ccebb4"></a><!-- doxytag: member="dgsequ.c::dgsequ" ref="af22b247cc134fb0ba90285e84ccebb4" args="(SuperMatrix *A, double *r, double *c, double *rowcnd, double *colcnd, double *amax, int *info)" --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">void dgsequ </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top"><a class="el" href="structSuperMatrix.html">SuperMatrix</a> * </td> <td class="mdname" nowrap> <em>A</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>double * </td> <td class="mdname" nowrap> <em>r</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>double * </td> <td class="mdname" nowrap> <em>c</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>double * </td> <td class="mdname" nowrap> <em>rowcnd</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>double * </td> <td class="mdname" nowrap> <em>colcnd</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>double * </td> <td class="mdname" nowrap> <em>amax</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>int * </td> <td class="mdname" nowrap> <em>info</em></td> </tr> <tr> <td class="md"></td> <td class="md">) </td> <td class="md" colspan="2"></td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p><pre> Purpose =======</pre><p><pre> DGSEQU computes row and column scalings intended to equilibrate an M-by-N sparse matrix A and reduce its condition number. R returns the row scale factors and C the column scale factors, chosen to try to make the largest element in each row and column of the matrix B with elements B(i,j)=R(i)*A(i,j)*C(j) have absolute value 1.</pre><p><pre> R(i) and C(j) are restricted to be between SMLNUM = smallest safe number and BIGNUM = largest safe number. Use of these scaling factors is not guaranteed to reduce the condition number of A but works well in practice.</pre><p><pre> See <a class="el" href="supermatrix_8h.html">supermatrix.h</a> for the definition of 'SuperMatrix' structure.</pre><p><pre> Arguments =========</pre><p><pre> A (input) SuperMatrix* The matrix of dimension (A->nrow, A->ncol) whose equilibration factors are to be computed. The type of A can be: Stype = SLU_NC; Dtype = SLU_D; Mtype = SLU_GE.</pre><p><pre> R (output) double*, size A->nrow If INFO = 0 or INFO > M, R contains the row scale factors for A.</pre><p><pre> C (output) double*, size A->ncol If INFO = 0, C contains the column scale factors for A.</pre><p><pre> ROWCND (output) double* If INFO = 0 or INFO > M, ROWCND contains the ratio of the smallest R(i) to the largest R(i). If ROWCND >= 0.1 and AMAX is neither too large nor too small, it is not worth scaling by R.</pre><p><pre> COLCND (output) double* If INFO = 0, COLCND contains the ratio of the smallest C(i) to the largest C(i). If COLCND >= 0.1, it is not worth scaling by C.</pre><p><pre> AMAX (output) double* Absolute value of largest matrix element. If AMAX is very close to overflow or very close to underflow, the matrix should be scaled.</pre><p><pre> INFO (output) int* = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value > 0: if INFO = i, and i is <= A->nrow: the i-th row of A is exactly zero > A->ncol: the (i-M)-th column of A is exactly zero</pre><p><pre> ===================================================================== </pre> </td> </tr></table><hr size="1"><address style="align: right;"><small>Generated on Fri Aug 1 22:40:40 2008 for SuperLU by <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.6 </small></address></body></html>⌨️ 快捷键说明
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