Re: [Help-glpk] Problem with writing to a text file from within Mathprog

[Meketon, Marc]

Also,

 

I use “Gusek” as my IDE for GLPK/GMPL.  When I ran the below code, but changing "c:\temp\MyTextFile.txt" to just "c:\temp\MyTextFile.txt", it placed the file in the same directory as it placed the .mod file.  I know that you said you looked in that the directory that you have the .mod file, but was that the same directory that you started glpsol?

 

That is, if you were in directory “c:\tttt” and called glpsol by using the command line:

 

C:\glpk\glpsol.exe –m c:\glpk\MyModFile.mod

 

The MyTextFile.txt file would probably be placed in “c:\tttt” and not “c:\glpk”

 

-Marc

 

From: help-glpk-bounces+address@hidden [mailto:help-glpk-bounces+address@hidden On Behalf Of Meketon, Marc
Sent: Saturday, May 02, 2015 8:44 AM
To: john tass; address@hidden
Subject: Re: [Help-glpk] Problem with writing to a text file from within Mathprog

 

I tried the following:

 

#test of writing out to a text file

solve;

printf : 'Hello World!\n' > "c:\temp\MyTextFile.txt";

printf : 'I am fine\n' >> "c:\temp\MyTextFile.txt";

end;

 

and it worked fine.  At first I thought that the colon (“:”) was the issue, since I never use it, but with or without the colon the code worked fine.

 

My guess:  you did not specify the full path of the output text file, and you are looking in the wrong place for it.  But that’s just a guess.

 

-Marc

 

From: help-glpk-bounces+address@hidden [mailto:help-glpk-bounces+address@hidden] On Behalf Of john tass
Sent: Friday, May 01, 2015 9:45 PM
To: address@hidden
Subject: [Help-glpk] Problem with writing to a text file from within Mathprog

 

Hi everybody,

I try to create a text file and write two lines in it from within Mathprog language.

First, I use Mathprog with a .mod file, which contains my model. At the end, after the code that determines my model, I have the following code:

....

.....

solve;

printf : 'Hello world!\n' > "MyTextFile.txt";

printf : 'I am fine\n' >> "MyTextFile.txt";

 

end;

Please note that I use a separate .dat file for the model's data. In addition, glpk manages to solve my model.I use the command line in order to call glpsol.

Nevertheless, no text file named "MyTextFile.txt" appears within the folder that glpsol.exe allong with .mod and .dat files are located. In the contrary, the file foo.sol, which is defined at the command line next to the option --output does appear within the mentioned folder.

Can any one help me?

Thanks a lot in advance

Tassopoulos Ioannis

P.S.

I use Windows 7 64bit OS.

 

--

Ioannis X. Tassopoulos

 

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