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<div class="moz-cite-prefix">Pietro,<br>
<br>
You should be able to read a gmpl file into Cbc (If GMPL installed
using ThirdParty). The format is something like<br>
<br>
cbc -import gmpl_model_file%gmpl_data_file -solve<br>
<br>
The code may be broken if nobody has used the facility for years
but should be easy to fix.<br>
<br>
John Forrest<br>
<br>
On 16/04/13 14:22, Pietro Scionti wrote:<br>
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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal">i am learning CBC in order to transition to
it from GLPK.<o:p></o:p></p>
<p class="MsoNormal">Since I cannot lose GMPL’s capabilities but
for various reasons I am constrained to use the unmodified
executable, my modus operandi is<o:p></o:p></p>
<p class="MsoNormal">1) run GLPK with the “--wlp model.lp
--check" option to make the mod-> lp transition<o:p></o:p></p>
<p class="MsoNormal">2) run cbc solving the .lp model<o:p></o:p></p>
<p class="MsoNormal">I would like to know, is there a way to
pass the model to be solved via the console standard input? My
models (all integer) get pretty big pretty fast, and I am
concerned I might use a huge amount of disk space that I then
need to clean up, while this could all be avoided if I could
feed the model to cbc in memory.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If i was not clear, what I want to
accomplish in GLPK can be done like this (language is C#, i am
on Windows 7):<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> System.Diagnostics.Process
process = new System.Diagnostics.Process();<o:p></o:p></p>
<p class="MsoNormal">
process.StartInfo.UseShellExecute = false;<o:p></o:p></p>
<p class="MsoNormal"> process.StartInfo.FileName =
glpsolPath; <o:p></o:p></p>
<p class="MsoNormal"> process.StartInfo.Arguments =
String.Format("--math /dev/stdin --output {0} --log {1}",
outputStreamPath, logPath);<o:p></o:p></p>
<p class="MsoNormal">
process.StartInfo.RedirectStandardInput = true;<o:p></o:p></p>
<p class="MsoNormal"> process.Start();<o:p></o:p></p>
<p class="MsoNormal"> StreamReader tr = new
StreamReader(modelPath);<o:p></o:p></p>
<p class="MsoNormal">
process.StandardInput.Write(tr.ReadToEnd());<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks everyone,<o:p></o:p></p>
<p class="MsoNormal">Pietro Scionti<o:p></o:p></p>
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