> I am a newbie to GLPK - but am enjoying this ! > I need to input (or specify) a large sparse integer matrix A which is > say 1500 X 1500. > Only a few entries are integers, say 100 of them are integers and the > rest are zeros. > How does one go about inputting this in to GLPK ?
> How is this done neatly in GLPK ? (ie initializing all entries of A to > zero) and inputting only the non-zero ones > I was trying something along the lines of saying (in the MOD file) > set I := 1..1500; > set J := 1..1500; > param A{i in I, j in J}, >=0, default 0.0; > How are the non-zero entries specified then ? > When I tried setting [in the DAT file] > A[1,2] := 5; A[3, 2]:=9, A[1,6]: = 6; > I get an error. > Please help !!! param A := [1,2] 5 [3,2] 9 [1,6] 6; Note that there are other, more convenient ways to specify parameters in the data section; see example models included in the distribution. _______________________________________________ Help-glpk mailing list Help-glpk@gnu.org http://lists.gnu.org/mailman/listinfo/help-glpk