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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/dlamch.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/dlamch.c File Reference</h1>Determines double precision machine parameters. <a href="#_details">More...</a><p><code>#include <stdio.h></code><br><code>#include "<a class="el" href="slu__Cnames_8h-source.html">slu_Cnames.h</a>"</code><br><table border="0" cellpadding="0" cellspacing="0"><tr><td></td></tr><tr><td colspan="2"><br><h2>Defines</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="dlamch_8c.html#ca1e6c3771fa0306e1dad2b11d22a8e5">TRUE_</a> (1)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="dlamch_8c.html#d4986ecbba005b963f63a85f7c8c281d">FALSE_</a> (0)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="dlamch_8c.html#3aa069ac3980707dae1e0530f50d59e4">abs</a>(x) ((x) >= 0 ? (x) : -(x))</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="dlamch_8c.html#c6afabdc09a49a433ee19d8a9486056d">min</a>(a, b) ((a) <= (b) ? (a) : (b))</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="dlamch_8c.html#ffe776513b24d84b39af8ab0930fef7f">max</a>(a, b) ((a) >= (b) ? (a) : (b))</td></tr><tr><td colspan="2"><br><h2>Functions</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="dlamch_8c.html#8f8bef103c45d87276d6508164f5883c">dlamch_</a> (char *cmach)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="dlamch_8c.html#eaa4a6b78a27d38535ca1a7dc010c92e">dlamc1_</a> (int *beta, int *t, int *rnd, int *ieee1)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="dlamch_8c.html#a05275111d3110333608138f59f3f8c3">dlamc2_</a> (int *beta, int *t, int *rnd, double *eps, int *emin, double *rmin, int *emax, double *rmax)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="dlamch_8c.html#35cd4981c9a7d3c46226a75f68720dad">dlamc3_</a> (double *a, double *b)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="dlamch_8c.html#141c735fa5fb73f28150470ee91da0f9">dlamc4_</a> (int *emin, double *start, int *base)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="dlamch_8c.html#0309c617fb0124d2d3ca73dfbdda9fa9">dlamc5_</a> (int *beta, int *p, int *emin, int *ieee, int *emax, double *rmax)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="dlamch_8c.html#9537f19743fcaaac6231895afa9f9e4d">pow_di</a> (double *ap, int *bp)</td></tr></table><hr><a name="_details"></a><h2>Detailed Description</h2><pre> -- LAPACK auxiliary routine (version 2.0) -- Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd., Courant Institute, Argonne National Lab, and Rice University October 31, 1992 </pre> <hr><h2>Define Documentation</h2><a class="anchor" name="3aa069ac3980707dae1e0530f50d59e4"></a><!-- doxytag: member="dlamch.c::abs" ref="3aa069ac3980707dae1e0530f50d59e4" args="(x)" --><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">#define abs </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top">x </td> <td class="mdname1" valign="top" nowrap> </td> <td class="md" valign="top"> ) </td> <td class="md" nowrap> ((x) >= 0 ? (x) : -(x))</td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p> </td> </tr></table><a class="anchor" name="d4986ecbba005b963f63a85f7c8c281d"></a><!-- doxytag: member="dlamch.c::FALSE_" ref="d4986ecbba005b963f63a85f7c8c281d" args="" --><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">#define FALSE_ (0) </td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p> </td> </tr></table><a class="anchor" name="ffe776513b24d84b39af8ab0930fef7f"></a><!-- doxytag: member="dlamch.c::max" ref="ffe776513b24d84b39af8ab0930fef7f" args="(a, b)" --><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">#define max </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top">a, <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>b </td> <td class="mdname1" valign="top" nowrap> </td> <td class="md" valign="top"> ) </td> <td class="md" nowrap> ((a) >= (b) ? (a) : (b))</td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p> </td> </tr></table><a class="anchor" name="c6afabdc09a49a433ee19d8a9486056d"></a><!-- doxytag: member="dlamch.c::min" ref="c6afabdc09a49a433ee19d8a9486056d" args="(a, b)" --><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">#define min </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top">a, <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>b </td> <td class="mdname1" valign="top" nowrap> </td> <td class="md" valign="top"> ) </td> <td class="md" nowrap> ((a) <= (b) ? (a) : (b))</td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p> </td> </tr></table><a class="anchor" name="ca1e6c3771fa0306e1dad2b11d22a8e5"></a><!-- doxytag: member="dlamch.c::TRUE_" ref="ca1e6c3771fa0306e1dad2b11d22a8e5" args="" --><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">#define TRUE_ (1) </td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p> </td> </tr></table><hr><h2>Function Documentation</h2><a class="anchor" name="eaa4a6b78a27d38535ca1a7dc010c92e"></a><!-- doxytag: member="dlamch.c::dlamc1_" ref="eaa4a6b78a27d38535ca1a7dc010c92e" args="(int *beta, int *t, int *rnd, int *ieee1)" --><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">int dlamc1_ </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top">int * </td> <td class="mdname" nowrap> <em>beta</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>t</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>rnd</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>ieee1</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> DLAMC1 determines the machine parameters given by BETA, T, RND, and IEEE1.</pre><p><pre> Arguments =========</pre><p><pre> BETA (output) INT The base of the machine.</pre><p><pre> T (output) INT The number of ( BETA ) digits in the mantissa.</pre><p><pre> RND (output) INT Specifies whether proper rounding ( RND = .TRUE. ) or chopping ( RND = .FALSE. ) occurs in addition. This may not</pre><p><pre> be a reliable guide to the way in which the machine performs</pre><p><pre> its arithmetic.</pre><p><pre> IEEE1 (output) INT Specifies whether rounding appears to be done in the IEEE 'round to nearest' style.</pre><p><pre> Further Details ===============</pre><p><pre> The routine is based on the routine ENVRON by Malcolm and incorporates suggestions by Gentleman and Marovich. See</pre><p><pre> Malcolm M. A. (1972) Algorithms to reveal properties of floating-point arithmetic. Comms. of the ACM, 15, 949-951.</pre><p><pre> Gentleman W. M. and Marovich S. B. (1974) More on algorithms that reveal properties of floating point arithmetic units. Comms. of the ACM, 17, 276-277.</pre><p><pre> ===================================================================== </pre> </td> </tr></table><a class="anchor" name="a05275111d3110333608138f59f3f8c3"></a><!-- doxytag: member="dlamch.c::dlamc2_" ref="a05275111d3110333608138f59f3f8c3" args="(int *beta, int *t, int *rnd, double *eps, int *emin, double *rmin, int *emax, double *rmax)" --><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">int dlamc2_ </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top">int * </td> <td class="mdname" nowrap> <em>beta</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>t</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>rnd</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>eps</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>emin</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>rmin</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>emax</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>rmax</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>⌨️ 快捷键说明
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