<div dir="ltr"><div>Hello everyone from CLP mail list. I need a help.</div><div> </div><div>Iīm using the CLP to a software I developed. CLP works very well to me. The problem is, when I started use some real data, with numbers greater, the CLP output file is using round to the values of the variables in the solution.</div>
<div> </div><div>I implemented the same mathematical model in GAMS/CPLEX, with exactly same input data, and see the result:</div><div> </div><div><table cols="3" border="0" rules="NONE" frame="VOID" cellspacing="0"><colgroup><col width="26"><col width="121"><col width="125"></colgroup><tbody><tr>
<td width="26" height="17" align="LEFT"><br></td><td width="121" align="CENTER">CLP</td><td width="125" align="CENTER">GAMS/CPLEX</td></tr><tr><td height="17" align="RIGHT">1</td><td align="CENTER"><font face="Times New Roman">$43.597.637,00</font></td>
<td align="CENTER"><font face="Times New Roman">$43.597.636,76</font></td></tr><tr><td height="17" align="RIGHT">2</td><td align="CENTER"><font face="Times New Roman">$23.108.017,00</font></td><td align="CENTER"><font face="Times New Roman">$23.108.017,02</font></td>
</tr><tr><td height="17" align="RIGHT">3</td><td align="CENTER"><font face="Times New Roman">$44.053.085,00</font></td><td align="CENTER"><font face="Times New Roman">$44.053.085,30</font></td></tr><tr><td height="17" align="RIGHT">
4</td><td align="CENTER"><font face="Times New Roman">$7.624.834,80</font></td><td align="CENTER"><font face="Times New Roman">$7.624.834,80</font></td></tr><tr><td height="17" align="RIGHT">5</td><td align="CENTER"><font face="Times New Roman">$17.312.266,00</font></td>
<td align="CENTER"><font face="Times New Roman">$17.312.265,81</font></td></tr><tr><td height="17" align="RIGHT">6</td><td align="CENTER"><font face="Times New Roman">$11.199.682,00</font></td><td align="CENTER"><font face="Times New Roman">$11.199.682,39</font></td>
</tr><tr><td height="17" align="RIGHT">7</td><td align="CENTER"><font face="Times New Roman">$16.631.305,00</font></td><td align="CENTER"><font face="Times New Roman">$16.631.304,60</font></td></tr><tr><td height="17" align="RIGHT">
8</td><td align="CENTER"><font face="Times New Roman">$9.903.795,80</font></td><td align="CENTER"><font face="Times New Roman">$9.903.795,82</font></td></tr><tr><td height="17" align="RIGHT">9</td><td align="CENTER"><font face="Times New Roman">$10.465.548,00</font></td>
<td align="CENTER"><font face="Times New Roman">$10.465.548,33</font></td></tr><tr><td height="17" align="RIGHT">10</td><td align="CENTER"><font face="Times New Roman">$12.723.051,00</font></td><td align="CENTER"><font face="Times New Roman">$12.723.051,42</font></td>
</tr><tr><td height="17" align="RIGHT">11</td><td align="CENTER"><font face="Times New Roman">$8.210.366,70</font></td><td align="CENTER"><font face="Times New Roman">$8.210.366,68</font></td></tr></tbody></table></div><div>
</div><div> For example, the line 1. The right solution, that one that respects all the constraints, is $43.597.636,76, or the GAMS/CPLEX solution. The CLP plot $43.597.637,00. Its the same solution, but CLP round the decimals, and put 637 in the place of 636,76.</div>
<div> </div><div>The same is happening with others values of the solution. But one thing is strange. Take a look in the lines 4 and 8. In this cases, CLP didnīt round the values!</div><div> </div><div>This is happening just to numbers greater than 10 million. I tried change the option output to 4 and 6 to improve precision but it didnīt worked to CLP 1.14.4.</div>
<div> </div><div>Can someone help me with new ideas?</div><div> </div><div>A small piece of the original CLP solution report is bellow. The variable f(1,13) is that one in line 1 in the table above.</div><div> </div><div>
optimal<br>Objective value -1.6527462e+008<br> 1 f(24,27) 1.6526604e+008 0<br> 5 f(1,13) 43597637 0<br> 7 f(13,14) 43597637 0<br>
10 f(2,14) 23108017 0<br> 14 f(3,15) 44053085 0<br> 18 f(4,16) 7624834.8 0</div><div>
</div><div>Best Regards,</div><div>Jack</div><div> </div></div>