[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Help-glpk] "multiplication of linear forms not allowed"

From: Reginald Beardsley
Subject: Re: [Help-glpk] "multiplication of linear forms not allowed"
Date: Mon, 22 Oct 2012 19:30:52 -0700 (PDT)

After reading the responses and pondering the problem, I realize that I was 
almost certainly posing the wrong question.

I can produce a solution in multiple passes by reformulating the problem 
between passes.

To wit:

If sum{j in J} B[i,j] = 0 drop all of the ith terms and seek a solution to the 
new set of equations.

That's at worst clunky, but clearly doable.   So it seems to me the concept is 
sound even though my expression of it was not. I am not able to say if it's 
doable in a single pass.  This is very much of a learning experience for me.

I'd be very interested in seeing the binary variable example from  p. 43 of the 
CMPL manual in GMPL form. Or any other examples that impose the sort of logic 
outlined above.  It may not help me now, but might prove useful later.  The 
disjoint feature sets and notation of AMPL, CMPL, GMPL, etc. make things 
challenging for a novice reading everything he can get a hold of. 

Thanks to all,

reply via email to

[Prev in Thread] Current Thread [Next in Thread]