How can I print hole model, objective + constrains ? Set the uper bount to infinity and get uper/lower bount of a variable?
On Sun, Jul 31, 2011 at 6:58 PM, glpk xypron <[email protected]> wrote: > Hello Onor, > > >> for (i <- 0 to col.size-1) { > >> GLPK.glp_set_obj_coef(lp, i,coef(i)) > >> } > if you have n columns, GLPK number these 1 to n. You possibly > wanted to write: > GLPK.glp_set_obj_coef(lp, i + 1,coef(i)) > > Cf. sample.c on page 15 of glpk-4.45/doc/glpk.pdf > > >> GLPK.glp_set_col_bnds(lp, colId+1, GLPKConstants.GLP_LO, 0,1000) > The number 1000 will be ignored. > The lower bound will be set to 0. > > Best regards > > Xypron > > -------- Original-Nachricht -------- > > Datum: Sun, 31 Jul 2011 16:07:01 +0200 > > Betreff: Re: [Help-glpk] implementing constraints in Scala > > > thank you very much I have some more question > > > > there is a problem I got no solution and i dont knew why. > > > > Could you tell me in which function(s) is the problem? > > > > the contraints I did as you told me. I change only GLP_UP; FX > > > > > > startModelBuilding(nbRows : Int, nbCols : Int){ > > lp = GLPK.glp_create_prob() > > GLPK.glp_add_cols(lp, nbCols) > > } > > > > def setBounds(colId : Int, low : Double, up : Double) { > > GLPK.glp_set_col_bnds(lp, colId+1, GLPKConstants.GLP_DB, low, up) > > } > > > > def setUnboundUpperBound(colId : Int) { > > GLPK.glp_set_col_bnds(lp, colId+1, GLPKConstants.GLP_LO, 0,1000) > > } > > > > def addObjective(coef : Array[Double], col : Array[Int], minMode : > > Boolean = true) { > > GLPK.glp_set_obj_name(lp, "objective"); > > GLPK.glp_set_obj_dir(lp, if (minMode) GLPKConstants.GLP_MIN else > > GLPKConstants.GLP_MAX) > > for (i <- 0 to col.size-1) { > > GLPK.glp_set_obj_coef(lp, i,coef(i)) > > } > > } > > > > def solveModel() : Int = { > > println("solveModel"); > > val iocp = new glp_iocp(); > > GLPK.glp_init_iocp(iocp); > > iocp.setPresolve( > > GLPKConstants.GLP_ON); > > val ret = GLPK.glp_intopt(lp, iocp); > > > > if (ret == 0) { > > sol = Array.tabulate(nbCols)(col => GLPK.glp_mip_col_val(lp,col > > +1)) > > objectiveValue = GLPK.glp_mip_obj_val(lp) > > > > ret > > } else { > > System.out.println("The problem could not be solved"); > > ret > > -- > Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir > belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de >
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