[Help-glpk] Set of sets

[xypron]

Hello Andrew,

sets of sets are not to be properly supported by GLPK:

The for statement does not support set of sets:
set M{1..2};
solve;
for {m in M}
  display m;
data;
set M[1] := 1 2;
set M[2] := A B C;

results in
M must be subscripted

Setof does not support set of sets:
set M := setof{ i in {1..3} } {1..i};

results in
integrand following setof{...} has invalid type

set M:= {{1..2}, {1..3}};
results in a set of tuples ( {1..2} cross {1..3} ). It should better return
a set of sets.

Same for
set M:= {({1..2}), ({1..3})};

Same for 
set A := {1..2};
set B := {1..3};
set M:= {A,B};

cf. http://lists.gnu.org/archive/html/help-glpk/2008-05/msg00043.html

Best regards

Xypron

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