RE: [Help-glpk] call solve statement multiple times

[Gottfried Lindner]

Sorry that I ask once more because I would like to understand it:

Lpx_read_model is the function for reading a model file. The 3.
parameter gives a file, in which output of the display-command is
written. But this function doesn't solve the problem? And all display
output comes as reaction of this call?
So I don't understand the statement in the MathProg manual on page 30:
"The solve statement causes solving the model, ..."

To solve the model I would call e.g. lpx_simplex. But in what way is the
solution then displayed via a display-statement in the model file?

Thank you

Gottfried Lindner
 
Mail: address@hidden
Besuchen Sie unsere Homepage: http://www.ublindner.de 


-----Original Message-----
From: Meketon, Marc [mailto:address@hidden 
Sent: Montag, 19. Juni 2006 15:35
To: Gottfried Lindner; address@hidden; yo yo
Subject: RE: [Help-glpk] call solve statement multiple times

You can have "display" and "print" statements after the "solve"
statement.  Which means you can display the solution.  So the below
first solves the model then calls a display statement to show the
answer.

... model ...
solve;
display x;


-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf
Of Gottfried Lindner
Sent: Monday, June 19, 2006 05:17
To: address@hidden
Subject: RE: [Help-glpk] call solve statement multiple times

Hello,

To my understandig the solve-Statement in the model has no effect.

There is an API call for reading the model, which fills the internal
data structures. For solving the problem there are other API functions
which must be called explicitly afterwords.

Regards
Gottfried Lindner
 
Mail: address@hidden
Besuchen Sie unsere Seite:
http://www.informatikfuchs.de/Software/GLPK/LiMath_Optimierung.htm



-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of
yo yo
Sent: Montag, 19. Juni 2006 00:33
To: address@hidden
Subject: [Help-glpk] call solve statement multiple times

Hello,

In the doc of MathProg language, it is said that we
can't call the solve statement multiple times.
Would it be possible to make it callable multiple
times, so that we can make a revise of the matrix
between the calls? (Like in the mosel language of
XPress).
This would be convenient to easily implement recursive
linearisation algorithms.

Thanks,
Lionel.


        

        
                
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