[Help-glpk] Constraint Problem

[gung_]

Everyone:

   hi.
   I need your help.when I write the constraint section of '.mod' file in GNU 
MathProg,I met a question.My problem is like this : 
  set I;
  set J;
  set K;

  param interval,>0;
  param cap{i in I},integer>0;
  param efc{j in J,k in K}>0;
  var yesno{i in I,j in J,k in K},binary; 
  var pnum{i in I,j in J,k in K},integer,>=0;
  s.t.xz2{i in I,j in J}:(sum{k in K}yesno[i,j,k]-1)*interval<=cap[i]*nl-sum {k 
in K}(efc[j,k]*pnum[i,j,k]);

    because I found that when sum{k in K} yesno[i,j,k] is not more than 1, I 
will get the wrong answer,I decide change this constraint to:
  s.t.xz2{i in I,j in J}:if sum{k in K}yesno[i,j,k]<=1 then 0 else (sum{k in 
K}yesno[i,j,k]-1)*interval<=cap[i]*nl-sum {k in K}(efc[j,k]*pnum[i,j,k]); 
    then the glpsol said"operand preceding<= has valid type","modal processing 
error".
   Can you help me solve this problem ?Thank you!
                                                            charles 
                                                            2007.8.26 

 

 

 





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Everyone:

   hi.
   I need your help.when I write the constraint section of '.mod' file in GNU MathProg,I met a question.My problem is like this :
  set I;
  set J;
  set K;

  param interval,>0;
  param cap{i in I},integer>0;
  param efc{j in J,k in K}>0;
  var yesno{i in I,j in J,k in K},binary;
  var pnum{i in I,j in J,k in K},integer,>=0;
  s.t.xz2{i in I,j in J}:(sum{k in K}yesno[i,j,k]-1)*interval<=cap[i]*nl-sum {k in K}(efc[j,k]*pnum[i,j,k]);

    because I found that when sum{k in K} yesno[i,j,k] is not more than 1, I will get the wrong answer,I decide change this constraint to:
  s.t.xz2{i in I,j in J}:if sum{k in K}yesno[i,j,k]<=1 then 0 else (sum{k in K}yesno[i,j,k]-1)*interval<=cap[i]*nl-sum {k in K}(efc[j,k]*pnum[i,j,k]);
    then the glpsol said"operand preceding<= has valid type","modal processing error".
   Can you help me solve this problem ?Thank you!
                                                            charles
                                                            2007.8.26

 

 

 

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