Re: [Help-glpk] use GLPK to solve LP without printing anything on terminal
Have you considered looking at t1.cs from glpk's example directory and glpk's API documentation? Let us look now at t1.cs. First the example was written for Linux so we change the line const string glpkLibrary = libglpk.so; to const string glpkLibrary = glpk.dll; //*** and run it as is t1.exe 98 1001 produces: a = 98, b = 1001 Hello Nigel Trying 98 GLPK Simplex Optimizer, v4.55 1 row, 2 columns, 2 non-zeros 0: obj = 0.0e+000 infeas = 1.000e+000 (0) * 1: obj = 0.0e+000 infeas = 0.000e+000 (0) OPTIMAL LP SOLUTION FOUND GLPK Integer Optimizer, v4.55 1 row, 2 columns, 2 non-zeros 2 integer variables, none of which are binary Integer optimization begins... + 1: mip = not found yet = -inf (1; 0) Solution found by heuristic: 0 + 2: mip = 0.0e+000 = tree is empty 0.0% (0; 5) INTEGER OPTIMAL SOLUTION FOUND x = -10, y = 1, a*x + b*y = 21 Trying 21 GLPK Simplex Optimizer, v4.55 1 row, 2 columns, 2 non-zeros * 2: obj = 0.0e+000 infeas = 0.000e+000 (0) OPTIMAL LP SOLUTION FOUND GLPK Integer Optimizer, v4.55 1 row, 2 columns, 2 non-zeros 2 integer variables, none of which are binary Integer optimization begins... + 2: mip = not found yet = -inf (1; 0) Solution found by heuristic: 0 + 2: mip = 0.0e+000 = tree is empty 0.0% (0; 3) INTEGER OPTIMAL SOLUTION FOUND x = 41, y = -4, a*x + b*y = 14 Trying 14 GLPK Simplex Optimizer, v4.55 1 row, 2 columns, 2 non-zeros * 2: obj = 0.0e+000 infeas = 0.000e+000 (0) OPTIMAL LP SOLUTION FOUND GLPK Integer Optimizer, v4.55 1 row, 2 columns, 2 non-zeros 2 integer variables, none of which are binary Integer optimization begins... + 2: mip = not found yet = -inf (1; 0) Solution found by heuristic: 0 + 3: mip = 0.0e+000 = tree is empty 0.0% (0; 5) INTEGER OPTIMAL SOLUTION FOUND x = -51, y = 5, a*x + b*y = 7 Trying 7 Solution is 7 Goodbye Nigel All this output from glpk shows its working but is distracting so: 1. define GLP_OFF. In C# 5 these constants would better in an enum say GPL so we could then use GLP.OFF but this is the example written in 2008 that we have for now. readonly int GLP_OFF = 0; //*** 2. add the link into glpk.dll for glp_term_out: [DllImport(glpkLibrary, SetLastError = true)] //*** static extern int glp_term_out(int flag); //*** 3. use it to turn glpk's terminal output off: glp_term_out(GLP_OFF); //*** compiling and running this version t1.exe 98 1001 produces: a = 98, b = 1001 Hello Nigel Trying 98 x = -10, y = 1, a*x + b*y = 21 Trying 21 x = 41, y = -4, a*x + b*y = 14 Trying 14 x = -51, y = 5, a*x + b*y = 7 Trying 7 Solution is 7 Goodbye Nigel which I hope is close to what you want. I have attached the modified t1.cs with the changes marked by //*** -- Nigel Galloway nigel_gallo...@operamail.com On Sat, Apr 11, 2015, at 07:04 AM, usa usa wrote: Also, How to indicate algorithms in GLPK to solve LP or IP from API ? GLPK has simplex, primal-dual and branch-bound algorithms, are there others? thanks On Sat, Apr 11, 2015 at 8:39 AM, Nigel Galloway nigel_gallo...@operamail.com wrote: __ If you are using the API then the output is controlled with GLP_ON and GLP_OFF. If you are using mathprog glpsol then -y filename will send the output to a file rather than your terminal. If using Linux and you absolutely don't want the output then -y /dev/nul should do you. -- Nigel Galloway nigel_gallo...@operamail.com On Fri, Apr 10, 2015, at 08:24 PM, usa usa wrote: Hi, I am using GLPK to solve some linear programming models. The model size is 200k variables and has one constraint. It took GLPK 13 minutes to load data and build the LP model. But, it took GLPK 17 minutes to solve it. Is it normal ? Why building a model took so long time ? Also, when GLPK is solving the model, it print out the detailed process of solving model on the command line terminal. How to make GLPK to solve the model silently without printing anything on terminal ? Thanks _ Help-glpk mailing list Help-glpk@gnu.org https://lists.gnu.org/mailman/listinfo/help-glpk -- http://www.fastmail.com - Or how I learned to stop worrying and love email again ___ Help-glpk mailing list Help-glpk@gnu.org https://lists.gnu.org/mailman/listinfo/help-glpk -- http://www.fastmail.com - Faster than the air-speed velocity of an unladen european swallow t1.cs Description: Binary data ___ Help-glpk mailing list Help-glpk@gnu.org https://lists.gnu.org/mailman/listinfo/help-glpk
Re: [Help-glpk] use GLPK to solve LP without printing anything on terminal
please refer to my answsers below. I called GLPK from C# in VS 2013 on win7. On Sat, Apr 11, 2015 at 12:13 AM, Reginald Beardsley pulask...@yahoo.com wrote: The answers to your questions depend almost entirely upon the computer you're using. What processor? Xeon What clock rate? 2.4 GHz How much memory? 8GB What else is running? no large applications are running. My GLPK application is the largest one. The GLPK used 80 MB memory. What operating system? win 7 You'll need to answer those questions to get a proper answer. Without all of that information any answer is just a wild guess. It's sometimes hard to determine even with that information. The information you don't want to see is there in part to answer some of your other questions. So to some degree you're asking to be told the answer without being told the answer. Reg On Fri, 4/10/15, usa usa usact2...@gmail.com wrote: Subject: [Help-glpk] use GLPK to solve LP without printing anything on terminal To: help-glpk@gnu.org Date: Friday, April 10, 2015, 10:24 PM Hi, I am using GLPK to solve some linear programming models. The model size is 200k variables and has one constraint. It took GLPK 13 minutes to load data and build the LP model. But, it took GLPK 17 minutes to solve it. Is it normal ? Why building a model took so long time ? Also, when GLPK is solving the model, it print out the detailed process of solving model on the command line terminal. How to make GLPK to solve the model silently without printing anything on terminal ? Thanks -Inline Attachment Follows- ___ Help-glpk mailing list Help-glpk@gnu.org https://lists.gnu.org/mailman/listinfo/help-glpk ___ Help-glpk mailing list Help-glpk@gnu.org https://lists.gnu.org/mailman/listinfo/help-glpk
Re: [Help-glpk] use GLPK to solve LP without printing anything on terminal
Also, How to indicate algorithms in GLPK to solve LP or IP from API ? GLPK has simplex, primal-dual and branch-bound algorithms, are there others? thanks On Sat, Apr 11, 2015 at 8:39 AM, Nigel Galloway nigel_gallo...@operamail.com wrote: If you are using the API then the output is controlled with GLP_ON and GLP_OFF. If you are using mathprog glpsol then -y filename will send the output to a file rather than your terminal. If using Linux and you absolutely don't want the output then -y /dev/nul should do you. -- Nigel Galloway nigel_gallo...@operamail.com On Fri, Apr 10, 2015, at 08:24 PM, usa usa wrote: Hi, I am using GLPK to solve some linear programming models. The model size is 200k variables and has one constraint. It took GLPK 13 minutes to load data and build the LP model. But, it took GLPK 17 minutes to solve it. Is it normal ? Why building a model took so long time ? Also, when GLPK is solving the model, it print out the detailed process of solving model on the command line terminal. How to make GLPK to solve the model silently without printing anything on terminal ? Thanks *___* Help-glpk mailing list Help-glpk@gnu.org https://lists.gnu.org/mailman/listinfo/help-glpk -- http://www.fastmail.com - Or how I learned to stop worrying and love email again ___ Help-glpk mailing list Help-glpk@gnu.org https://lists.gnu.org/mailman/listinfo/help-glpk ___ Help-glpk mailing list Help-glpk@gnu.org https://lists.gnu.org/mailman/listinfo/help-glpk
Re: [Help-glpk] use GLPK to solve LP without printing anything on terminal
Hi, I called GLPK from C# in VS 2013 on win7. The API that I called is: Solution mySolution = solver.Solve(myMathLPModel); How to use GLP_OFF to close the output on terminal ? Any help would be appreciated. Thanks On Sat, Apr 11, 2015 at 8:39 AM, Nigel Galloway nigel_gallo...@operamail.com wrote: If you are using the API then the output is controlled with GLP_ON and GLP_OFF. If you are using mathprog glpsol then -y filename will send the output to a file rather than your terminal. If using Linux and you absolutely don't want the output then -y /dev/nul should do you. -- Nigel Galloway nigel_gallo...@operamail.com On Fri, Apr 10, 2015, at 08:24 PM, usa usa wrote: Hi, I am using GLPK to solve some linear programming models. The model size is 200k variables and has one constraint. It took GLPK 13 minutes to load data and build the LP model. But, it took GLPK 17 minutes to solve it. Is it normal ? Why building a model took so long time ? Also, when GLPK is solving the model, it print out the detailed process of solving model on the command line terminal. How to make GLPK to solve the model silently without printing anything on terminal ? Thanks *___* Help-glpk mailing list Help-glpk@gnu.org https://lists.gnu.org/mailman/listinfo/help-glpk -- http://www.fastmail.com - Or how I learned to stop worrying and love email again ___ Help-glpk mailing list Help-glpk@gnu.org https://lists.gnu.org/mailman/listinfo/help-glpk ___ Help-glpk mailing list Help-glpk@gnu.org https://lists.gnu.org/mailman/listinfo/help-glpk
Re: [Help-glpk] use GLPK to solve LP without printing anything on terminal
If you are using the API then the output is controlled with GLP_ON and GLP_OFF. If you are using mathprog glpsol then -y filename will send the output to a file rather than your terminal. If using Linux and you absolutely don't want the output then -y /dev/nul should do you. -- Nigel Galloway nigel_gallo...@operamail.com On Fri, Apr 10, 2015, at 08:24 PM, usa usa wrote: Hi, I am using GLPK to solve some linear programming models. The model size is 200k variables and has one constraint. It took GLPK 13 minutes to load data and build the LP model. But, it took GLPK 17 minutes to solve it. Is it normal ? Why building a model took so long time ? Also, when GLPK is solving the model, it print out the detailed process of solving model on the command line terminal. How to make GLPK to solve the model silently without printing anything on terminal ? Thanks _ Help-glpk mailing list Help-glpk@gnu.org https://lists.gnu.org/mailman/listinfo/help-glpk -- http://www.fastmail.com - Or how I learned to stop worrying and love email again ___ Help-glpk mailing list Help-glpk@gnu.org https://lists.gnu.org/mailman/listinfo/help-glpk
Re: [Help-glpk] use GLPK to solve LP without printing anything on terminal
The answers to your questions depend almost entirely upon the computer you're using. What processor? What clock rate? How much memory? What else is running? What operating system? You'll need to answer those questions to get a proper answer. Without all of that information any answer is just a wild guess. It's sometimes hard to determine even with that information. The information you don't want to see is there in part to answer some of your other questions. So to some degree you're asking to be told the answer without being told the answer. Reg On Fri, 4/10/15, usa usa usact2...@gmail.com wrote: Subject: [Help-glpk] use GLPK to solve LP without printing anything on terminal To: help-glpk@gnu.org Date: Friday, April 10, 2015, 10:24 PM Hi, I am using GLPK to solve some linear programming models. The model size is 200k variables and has one constraint. It took GLPK 13 minutes to load data and build the LP model. But, it took GLPK 17 minutes to solve it. Is it normal ? Why building a model took so long time ? Also, when GLPK is solving the model, it print out the detailed process of solving model on the command line terminal. How to make GLPK to solve the model silently without printing anything on terminal ? Thanks -Inline Attachment Follows- ___ Help-glpk mailing list Help-glpk@gnu.org https://lists.gnu.org/mailman/listinfo/help-glpk ___ Help-glpk mailing list Help-glpk@gnu.org https://lists.gnu.org/mailman/listinfo/help-glpk
