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Lingo模型语言介绍

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发表于 2004-9-7 16:53:20 | 显示全部楼层 |阅读模式
< ><FONT size=3>二、<FONT face="Times New Roman">Lingo</FONT>模型语言介绍</FONT></P>
< ><FONT size=3><FONT face="Times New Roman">1</FONT>.为什么使用<FONT face="Times New Roman">Lingo</FONT></FONT></P>
< ><FONT size=3>(<FONT face="Times New Roman">1</FONT>)<FONT face="Times New Roman">Lingo</FONT>最大的功能之一就是它的数学建模语言。<FONT face="Times New Roman">Lingo</FONT>的模型语言可以让你用最普通的方法,就像标准的数学符合一样去表示你的问题。不仅可以详细的输入每一条约束条件,也可以用一条简单的语句表示整个一系列的相类似的约束条件。这样可以使模型更加容易去修改。</FONT></P>
<P ><FONT size=3>(<FONT face="Times New Roman">2</FONT>)<FONT face="Times New Roman">Lingo</FONT>建模语言的另一个方便的地方是它的<FONT face="Times New Roman">Data Section</FONT>(数据区域),数据区域容许从数学表达式中分离模型。此外,<FONT face="Times New Roman">Lingo</FONT>也可以从电子表格、数据库以及文本文件中读取数据。使数据不依赖于模型。这样可以更方便的维护、修改模型。</FONT><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><FONT size=3><FONT face="Times New Roman">2</FONT>.运输问题:</FONT></P>
<P ><FONT size=3><FONT face="Times New Roman">WW</FONT>公司有<FONT face="Times New Roman">6</FONT>个仓库,<FONT face="Times New Roman">8</FONT>家卖主。每一个仓库不能超过他们的供应能力,卖主也要尽可能得到满足。<FONT face="Times New Roman">WW</FONT>公司问题是,如何把每个仓库的产品运输给卖主,使总的运费最小。</FONT></P>
<P ><FONT size=3>产品生产数据:</FONT></P>
<P>
<TABLE  cellSpacing=0 cellPadding=0 border=1>

<TR >
<TD  width=139>
<P  align=center><B >仓库编号<p></p></B></P></TD>
<TD  width=132>
<P  align=center><B >数量<p></p></B></P></TD></TR>
<TR >
<TD  width=139>
<P  align=center><FONT face="Times New Roman">1</FONT></P></TD>
<TD  width=132>
<P  align=center><FONT face="Times New Roman">60</FONT></P></TD></TR>
<TR >
<TD  width=139>
<P  align=center><FONT face="Times New Roman">2</FONT></P></TD>
<TD  width=132>
<P  align=center><FONT face="Times New Roman">55</FONT></P></TD></TR>
<TR >
<TD  width=139>
<P  align=center><FONT face="Times New Roman">3</FONT></P></TD>
<TD  width=132>
<P  align=center><FONT face="Times New Roman">51</FONT></P></TD></TR>
<TR >
<TD  width=139>
<P  align=center><FONT face="Times New Roman">4</FONT></P></TD>
<TD  width=132>
<P  align=center><FONT face="Times New Roman">43</FONT></P></TD></TR>
<TR >
<TD  width=139>
<P  align=center><FONT face="Times New Roman">5</FONT></P></TD>
<TD  width=132>
<P  align=center><FONT face="Times New Roman">41</FONT></P></TD></TR>
<TR >
<TD  width=139>
<P  align=center><FONT face="Times New Roman">6</FONT></P></TD>
<TD  width=132>
<P  align=center><FONT face="Times New Roman">52</FONT></P></TD></TR></TABLE></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><FONT size=3>买主的需求:</FONT></P>
<P>
<TABLE  cellSpacing=0 cellPadding=0 border=1>

<TR >
<TD  width=139>
<P  align=center><B >买主<p></p></B></P></TD>
<TD  width=132>
<P  align=center><B >需求量<p></p></B></P></TD></TR>
<TR >
<TD  width=139>
<P  align=center><FONT face="Times New Roman">1</FONT></P></TD>
<TD  width=132>
<P  align=center><FONT face="Times New Roman">35</FONT></P></TD></TR>
<TR >
<TD  width=139>
<P  align=center><FONT face="Times New Roman">2</FONT></P></TD>
<TD  width=132>
<P  align=center><FONT face="Times New Roman">37</FONT></P></TD></TR>
<TR >
<TD  width=139>
<P  align=center><FONT face="Times New Roman">3</FONT></P></TD>
<TD  width=132>
<P  align=center><FONT face="Times New Roman">22</FONT></P></TD></TR>
<TR >
<TD  width=139>
<P  align=center><FONT face="Times New Roman">4</FONT></P></TD>
<TD  width=132>
<P  align=center><FONT face="Times New Roman">32</FONT></P></TD></TR>
<TR >
<TD  width=139>
<P  align=center><FONT face="Times New Roman">5</FONT></P></TD>
<TD  width=132>
<P  align=center><FONT face="Times New Roman">41</FONT></P></TD></TR>
<TR >
<TD  width=139>
<P  align=center><FONT face="Times New Roman">6</FONT></P></TD>
<TD  width=132>
<P  align=center><FONT face="Times New Roman">32</FONT></P></TD></TR>
<TR >
<TD  width=139>
<P  align=center><FONT face="Times New Roman">7</FONT></P></TD>
<TD  width=132>
<P  align=center><FONT face="Times New Roman">43</FONT></P></TD></TR>
<TR >
<TD  width=139>
<P  align=center><FONT face="Times New Roman">8</FONT></P></TD>
<TD  width=132>
<P  align=center><FONT face="Times New Roman">38</FONT></P></TD></TR></TABLE></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><FONT size=3>每种产品的运输费用<FONT face="Times New Roman"> ($):</FONT></FONT></P>
<P>
<TABLE  cellSpacing=0 cellPadding=0 border=1>

<TR >
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">          </FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">V1</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">V2</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">   V3   </FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">V4  </FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">V5  </FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">V6  </FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">V7  </FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">V8</FONT></P></TD></TR>
<TR >
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">W1 </FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">6</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">2</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">6</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">7</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">4</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">2</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">5</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">9</FONT></P></TD></TR>
<TR >
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">W2</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">4</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">9</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">5</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">3</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">8</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">5</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">8</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">2</FONT></P></TD></TR>
<TR >
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">W3     </FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">5</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">2</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">1</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">9</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">7</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">4 </FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">3</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">3</FONT></P></TD></TR>
<TR >
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">W4</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">7</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">6</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">7</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">3</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">9</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">2</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">7</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">1</FONT></P></TD></TR>
<TR >
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">W5     </FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">2</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">3</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">9</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">5</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">7</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">2</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">6</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">5</FONT></P></TD></TR>
<TR >
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">W6     </FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">5</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">5</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">2</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">2</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">8</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">1</FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">4 </FONT></P></TD>
<TD  vAlign=top width=63>
<P ><FONT face="Times New Roman">3</FONT></P></TD></TR></TABLE></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><FONT size=3>假设:</FONT></P>
<P ><FONT face="Times New Roman" size=3>i=1,….6</FONT></P>
<P ><FONT face="Times New Roman" size=3>j=1,…8</FONT></P>
<P ><FONT size=3><FONT face="Times New Roman">C<SUB>ij</SUB></FONT>表示单位产品从<FONT face="Times New Roman">i</FONT>仓库到<FONT face="Times New Roman">j</FONT>买主的运输费用。</FONT></P>
<P ><FONT size=3><FONT face="Times New Roman">X<SUB>ij</SUB></FONT>表示从<FONT face="Times New Roman">i</FONT>仓库到<FONT face="Times New Roman">j</FONT>买主的产品数量。</FONT></P>
<P ><FONT size=3><FONT face="Times New Roman">D<SUB>j</SUB></FONT>表示<FONT face="Times New Roman">j</FONT>买主的需求量</FONT></P>
<P ><FONT size=3><FONT face="Times New Roman">Q<SUB>i</SUB></FONT>表示<FONT face="Times New Roman">i</FONT>仓库的库存</FONT></P>
<P ><FONT size=3><FONT face="Times New Roman">Z</FONT>表示总运输费用</FONT></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><FONT face="Times New Roman"><FONT size=3>Min    </FONT></FONT><v:shape><v:imagedata><FONT face="Times New Roman" size=3></FONT></v:imagedata></v:shape></P>
<P ><FONT face="Times New Roman" size=3>ST</FONT><v:shape><v:imagedata><FONT face="Times New Roman" size=3></FONT></v:imagedata></v:shape></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><v:shape><v:imagedata><FONT face="Times New Roman" size=3></FONT></v:imagedata></v:shape></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P>
<TABLE  cellSpacing=0 cellPadding=0 align=left border=1>

<TR >
<TD  vAlign=top width=151>
<P ><FONT face="Times New Roman">Math Notation </FONT></P></TD>
<TD  vAlign=top width=312>
<P ><FONT face="Times New Roman">LINGO Syntax</FONT></P></TD></TR>
<TR >
<TD  vAlign=top width=151>
<P ><FONT face="Times New Roman">Minimize</FONT></P></TD>
<TD  vAlign=top width=312>
<P ><FONT face="Times New Roman">MIN=</FONT></P></TD></TR>
<TR >
<TD  vAlign=top width=151>
<P ><FONT face="Times New Roman">       </FONT><v:shape><v:imagedata><FONT face="Times New Roman"></FONT></v:imagedata></v:shape></P></TD>
<TD  vAlign=top width=312>
<P ><FONT face="Times New Roman">@SUM(LINKS(I, J)</FONT></P></TD></TR>
<TR >
<TD  vAlign=top width=151>
<P ><FONT face="Times New Roman">COST ij   </FONT></P></TD>
<TD  vAlign=top width=312>
<P ><FONT face="Times New Roman">COST(I,J)</FONT></P></TD></TR>
<TR >
<TD  vAlign=top width=151>
<P >·<FONT face="Times New Roman">    </FONT></P></TD>
<TD  vAlign=top width=312>
<P ><FONT face="Times New Roman">*</FONT></P></TD></TR>
<TR >
<TD  vAlign=top width=151>
<P ><FONT face="Times New Roman">VOLUME ij     </FONT></P></TD>
<TD  vAlign=top width=312>
<P ><FONT face="Times New Roman">VOLUME(I,J)</FONT></P></TD></TR>
<TR >
<TD  vAlign=top width=151>
<P ><p><FONT face="Times New Roman"> </FONT></p></P></TD>
<TD  vAlign=top width=312>
<P ><p><FONT face="Times New Roman"> </FONT></p></P></TD></TR>
<TR >
<TD  vAlign=top width=151>
<P ><FONT face="Times New Roman">for all j in VENDORS</FONT></P></TD>
<TD  vAlign=top width=312>
<P ><FONT face="Times New Roman">@FOR( VENDORS( J): )</FONT></P></TD></TR>
<TR >
<TD  vAlign=top width=151>
<P ><v:shape><v:imagedata><FONT face="Times New Roman"></FONT></v:imagedata></v:shape></P></TD>
<TD  vAlign=top width=312>
<P ><FONT face="Times New Roman">@SUM( WAREHOUSES( I): )</FONT></P></TD></TR>
<TR >
<TD  vAlign=top width=151>
<P ><FONT face="Times New Roman">VOLUME ij     </FONT></P></TD>
<TD  vAlign=top width=312>
<P ><FONT face="Times New Roman">VOLUME( I, J)</FONT></P></TD></TR>
<TR >
<TD  vAlign=top width=151>
<P >=</P></TD>
<TD  vAlign=top width=312>
<P >=</P></TD></TR>
<TR >
<TD  vAlign=top width=151>
<P ><FONT face="Times New Roman">DEMAND j     </FONT></P></TD>
<TD  vAlign=top width=312>
<P ><FONT face="Times New Roman">DEMAND( J)</FONT></P></TD></TR>
<TR >
<TD  vAlign=top width=151>
<P ><p><FONT face="Times New Roman"> </FONT></p></P></TD>
<TD  vAlign=top width=312>
<P ><p><FONT face="Times New Roman"> </FONT></p></P></TD></TR></TABLE></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
<P ><p><FONT face="Times New Roman" size=3> </FONT></p></P>
 楼主| 发表于 2004-9-7 16:54:46 | 显示全部楼层
< 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">以上的运输的题Lingo</FONT>表示:</FONT></P>< 0cm 0cm 0pt"><p><FONT face="Times New Roman" size=3> </FONT></p></P>< 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>MODEL:</FONT></P><P 0cm 0cm 0pt"><p><FONT face="Times New Roman" size=3> </FONT></p></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>MIN = @SUM( LINKS( I, J): COST( I, J) * VOLUME( I, J));</FONT></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>@FOR( VENDORS( J): @SUM( WAREHOUSES( I): VOLUME( I, J)) = DEMAND( J));</FONT></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>@FOR( WAREHOUSES( I): @SUM( VENDORS( J): VOLUME( I, J)) &lt;= CAPACITY( I));</FONT></P><P 0cm 0cm 0pt"><p><FONT face="Times New Roman" size=3> </FONT></p></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>END</FONT></P><P 0cm 0cm 0pt"><p><FONT face="Times New Roman" size=3> </FONT></p></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>Defining the Sets</FONT></P><P 0cm 0cm 0pt"><p><FONT face="Times New Roman" size=3> </FONT></p></P><P 0cm 0cm 0pt"><FONT size=3>以关键词<FONT face="Times New Roman">SETS:</FONT>开始,<FONT face="Times New Roman">ENDSETS</FONT>结束</FONT></P><P 0cm 0cm 0pt"><FONT size=3>上例中,我们定义三个集合:</FONT></P><P 0cm 0cm 0pt"><p><FONT face="Times New Roman" size=3> </FONT></p></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>SETS:</FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">   WAREHOUSES / WH1 WH2 WH3 WH4 WH5 WH6/: CAPACITY;</FONT></FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">   VENDORS / V1 V2 V3 V4 V5 V6 V7 V8/: DEMAND;</FONT></FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">   LINKS( WAREHOUSES, VENDORS): COST, VOLUME;</FONT></FONT></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>ENDSETS</FONT></P><P 0cm 0cm 0pt"><p><FONT face="Times New Roman" size=3> </FONT></p></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>Inputting the Data</FONT></P><P 0cm 0cm 0pt"><p><FONT face="Times New Roman" size=3> </FONT></p></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>DATA:</FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">   CAPACITY = 60 55 51 43 41 52;</FONT></FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">   DEMAND = 35 37 22 32 41 32 43 38;</FONT></FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">   COST = 6 2 6 7 4 2 5 9</FONT></FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">          4 9 5 3 8 5 8 2</FONT></FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">          5 2 1 9 7 4 3 3</FONT></FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">          7 6 7 3 9 2 7 1</FONT></FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">          2 3 9 5 7 2 6 5</FONT></FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">          5 5 2 2 8 1 4 3;</FONT></FONT></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>ENDDATA</FONT></P><P 0cm 0cm 0pt"><p><FONT face="Times New Roman" size=3> </FONT></p></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>MODEL:</FONT></P><P 0cm 0cm 0pt"><p><FONT face="Times New Roman" size=3> </FONT></p></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>!A 6 Warehouse 8 Vendor Transportation Problem;</FONT></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>SETS:</FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">   WAREHOUSES/ WH1 WH2 WH3 WH4 WH5 WH6/: CAPACITY;</FONT></FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">   VENDORS/ V1 V2 V3 V4 V5 V6 V7 V8/: DEMAND;</FONT></FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">   LINKS (Warehouses, Vendors): COST, VOLUME;</FONT></FONT></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>ENDSETS</FONT></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>!The objective;</FONT></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>MIN = @SUM( LINKS( I, J): </FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">    COST( I, J) * VOLUME( I, J));</FONT></FONT></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>!The demand constraints;</FONT></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>@FOR( VENDORS( J): </FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">    @SUM( WAREHOUSES( I): VOLUME( I, J)) = </FONT></FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">     DEMAND( J));</FONT></FONT></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>!The capacity constraints;</FONT></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>@FOR( WAREHOUSES( I): </FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">    @SUM( VENDORS( J): VOLUME( I, J)) &lt;= </FONT></FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">     CAPACITY( I));</FONT></FONT></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>!Here is the data;</FONT></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>DATA:</FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">   CAPACITY = 60 55 51 43 41 52;</FONT></FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">   DEMAND = 35 37 22 32 41 32 43 38;</FONT></FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">   COST = 6 2 6 7 4 2 5 9 </FONT></FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">          4 9 5 3 8 5 8 2</FONT></FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">          5 2 1 9 7 4 3 3</FONT></FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">          7 6 7 3 9 2 7 1</FONT></FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">          2 3 9 5 7 2 6 5</FONT></FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">          5 5 2 2 8 1 4 3</FONT></FONT></P><P 0cm 0cm 0pt"><FONT size=3><FONT face="Times New Roman">ENDDATA     </FONT></FONT></P><P 0cm 0cm 0pt"><p><FONT face="Times New Roman" size=3> </FONT></p></P><P 0cm 0cm 0pt"><FONT face="Times New Roman" size=3>END</FONT></P>
发表于 2004-9-9 09:44:30 | 显示全部楼层
可以用于符号的开放运算,和求反三角函数的运算吗
 楼主| 发表于 2004-9-12 06:39:57 | 显示全部楼层
可以
发表于 2004-9-13 04:38:31 | 显示全部楼层
<>以前都没有学的</P><>现在只有几天了,是否就会用一点呢??</P>
发表于 2004-9-19 19:58:03 | 显示全部楼层
可以定义分段函数吗?急用!!!!
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