[Cmpl] Question on line names

[Maria Giatsoglou]

Hello,

I have a question regarding the approach followed for line naming in loops
that iterate over sets of 2-tuples.
To clarify the issue I attach the following example:

In my cmpl file I have the following constraint generation loop:


test_line_name {len(A) > 0 : {[i,j] in A:
 echo i; echo j;
 sum{k in (A_B *> [i,*]): x[i,k] * B[k]} - sum{k in (A_B *> [j,*]): x[j,k]
* B[k]}  <= C[i,j];
 sum{k in (A_B *> [j,*]): x[j,k] * B[k]} - sum{k in (A_B *> [i,*]): x[i,k]
* B[k]}  >= D[i,j];
}

In the above, A and A_B are instances of set[2] used as parameters, C and D
are again parameters defined over A (i.e. C[A] and D[A]), B is another
array of parameters defined over a set of values, and x defined over A_B
(i.e. x[A_B]) represents the problem variables. All values are provided
though jCMPL.


When I run the optimizer and print the solution report, I get strange
values for the line names... For example, in the case of a tuple ["p","r"]
the line names generated for the two constraints are
 "test_line_name (38985568,1)" and   "test_line_name (38985568,2)" (whereas
values "p" and "r" are printed correctly with the echo statements inside
the loop).

What does this numeric value of 38985568 corresponds to?
I need to have a mapping between the type of constraint (as defined by me)
and the parameters that populate it (i and j in my example), so that I can
use it at a later phase in my project in case of a conflict.

I have also tried to transform the above formulation into double loops, as
below, but the problem persists although now I get line names of the form
" test_line_name (~1073741828,~1073741830,1)".

test_line_name {i in (A*> [*,/]):{j in (A*> [i,*]):

sum{k in (A_B *> [j,*]): x[j,k] * B[k]} - sum{k in (A_B *> [i,*]): x[i,k] *
[k]} <= C[i,j];
sum{k in (A_B *> [i,*]): x[i,k] * B[k]} - sum{k in (A_B *> [j,*]): x[j,k] *
B[k]} >= D[i,j];
}}

I also noticed that inside the loop I can use an expression such as:

test_line_name_$i$: sum{k in (A_B *> [j,*]): x[j,k] * B[k]} - sum{k in
(A_B *> [i,*]): x[i,k] * [k]} <= C[i,j];

which correctly prints the line name using the value of i, but the
expression

test_line_name_$i$_$j$: sum{k in (A_B *> [j,*]): x[j,k] * B[k]} - sum{k in
(A_B *> [i,*]): x[i,k] * [k]} <= C[i,j];

does not work, since only one variable is supported.

Any ideas / suggestions on how to approach this issue are more than welcome!

Thank you very much in advance,
Maria
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