source: html/trunk/Clp/faq.html @ 952

Last change on this file since 952 was 952, checked in by jpfasano, 17 years ago

Reworded sentence describing COIN.

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1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
2<html>
3<head>
4    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
5    <title>Clp Homepage</title>
6    <link rel="stylesheet" href="../coin.css" type="text/css">
7</head>
8
9<!-- <div align="center"><h3>Clp Homepage</h3></div> -->
10
11<body>
12
13<table>
14  <tbody>
15    <tr>
16      <td>
17        &nbsp;
18      </td>
19      <td>
20        <div align="center">
21          <img id="ClpBanner"
22            height="60" width="600"
23            border="0"
24            src="images/ClpBanner.gif"
25            alt="Clp">
26        </div>
27      </td>
28    </tr>
29    <tr>
30      <td valign="top" width="120">
31        <a href="index.html">
32          <img id="ClpNavHome"
33            height="25" width="120"
34            border="0"
35            src="images/ClpNav-Home.gif"
36            alt="Home">
37        </a>
38        <a href="faq.html">
39          <img id="ClpNavFAQ"
40            height="25" width="120"
41            border="0"
42            src="images/ClpNav-FAQ-Hi.gif"
43            alt="Home">
44        </a>
45        <a href="documentation.html">
46          <img id="ClpNavDoc"
47            height="25" width="120"
48            border="0"
49            src="images/ClpNav-Doc.gif"
50            alt="Home">
51        </a>
52      </td>
53      <!--              -->
54      <!-- MAIN CONTENT -->
55      <!--              -->
56      <td>
57        <div class="main-content">
58        <p>
59          <!-- <marquee>&quot;Coming Soon&quot;</marquee> -->
60        </p>
61
62              <p ALIGN=LEFT><b>Q: What is the <a href="../index.html">COIN-OR</a> LP code?</b><br>
63                A: The <a href="index.html">COIN LP</a> code is designed
64                to be a high quality Simplex code.
65                The first release was 0.90 and we are now up to 0.93.</p>
66
67             
68              <p><b>Q: Is it reliable?</b><br>
69                A: It has been tested on many problems of up to
70                1.5 million constraints and has shown itself as
71                reliable as OSL.  It is also being tested in the
72                context of SBB, but more testing is needed before
73                it can get to version 1.0.</p>
74
75
76              <p><b>Q: Is it as fast as OSL?</b><br>
77                A: It uses sparse techniques designed for very
78                large problems.  The design criteria where for it
79                not to be too slow.  Some speed has been
80                sacrificed to make the code less opaque than
81                OSL (not difficult:-)).</p>
82
83
84              <p><b>Q: When will version 1.0 be available?</b><br>
85                A: It depends on the interest of the COIN audience and
86                on the workload of John Forrest.  It was meant to be
87                a community effort, but rather more was done before
88                the prototype was released than had been intended.
89                It now has a presolve, but it still needs more
90                done to it.</p>
91
92
93              <p><b>Q: What are a few of its features?</b><br>
94                A: Both dual and primal algorithms can use matrix
95                storage methods provided by user e.g. all 1.0.  At
96                present just OsiPackedMatrix is supported.  The Dual
97                algorithm has Dantzig and Steepest edge row pivot choices
98                and new ones may be provided by user.  Similarly for
99                the column pivot choice in Primal.  Primal also
100                uses a non linear cost.  This should work for
101                piecewise linear convex functions and I will try
102                to get it to work for non-convex functions.</p>
103
104
105              <p><b>Q: What can the community do to help?</b><br>
106                A: Lots.</p>
107              <ul>
108                <li>Comment on the design.  I have not invested
109                so much time that it will hurt too much to totally
110                redesign it.</li>
111                <li>Break the code - even better - mend the code.  </li>
112                <li>Add national language support in your own favo(u)rite language.</li>
113                <li>Improve the driver in Clp to give more help etc</li>
114              </ul>
115
116
117              <p><b>Q: Is there any documentation for CLP?</b><br>
118                A: Not much yet. For the user, there are very few
119                knobs to twiddle anyway.  Just execute clp
120                in the Clp directory and follow instructions.</p>
121
122
123              <p><b>Q: What platforms does CLP run on?</b><br>
124                A: CLP has been tested on:</p>
125              <ul>
126                <li>Linux using g++ V3.1.1.</li>
127                <li>Windows using Microsoft Visual C++ V6</li>
128                <li>AIX using xlC (not supported by current Makefile).</li>
129              </ul>
130
131
132
133        <p>
134          <!-- <a href="../faqs.html#CLP">General CLP FAQ</a> -->
135        </p>
136        </div>
137        <!--        -->
138        <!-- FOOTER -->
139        <!--        -->
140        <div class="footer">
141          <p>
142            This page last modified <!--#echo var="LAST_MODIFIED"-->
143          </p>
144        </div>
145      </td>
146    </tr>
147  </tbody>
148</table>
149
150</body>
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