[Help-glpk] [Fwd: GLPK printing with if and iterative loop (continued)]

[Andrew Makhorin]

-------- Forwarded Message --------
From: Alan Zinober <address@hidden>
To: address@hidden
Subject: GLPK printing with if and iterative loop (continued)
Date: Sun, 20 Feb 2011 15:18:09 +0000

 

Oscar, many thanks for your assistance. 

However, I think I actually need a sum ... 

With your recommendation for my question below I used: 

printf {i in Trainer, j4 in Course4, j5 in Course5, j6 in Course6:
x4[i,j4] + x5[i,j5] + x6[i,j6] = 0} "%s ",i; 

to obtain: 

A A A A B B B B C C D D D D E E G G H H H H I I I I J J J J K K 

My Trainer set is    A B C D E F G H I J K

In fact I wish to print 

A  B  D  G  H  I  J 

where i is printed only if there are 4 repeats above (when using your
recommendation). 

i.e. for i iterating and for summing over the cases j4, j5, j6 jointly. 

for Trainer i,   if sum (iterating over j4, j5, j6)  = 0, then print i. 

eg  printf (if  x4[i,C41] + x4[i,C42] + x5[i,C51], + x5{i,C52] +
x5[i,C53] + x6[i,C61] = 0 then "%s  "), i); 


Why should this command below 

for {i in Trainer} 
 printf (if sum{j4 in Course4} x4[i,j4] 
             + sum{j5 in Course5} x5[i,j5] 
               + sum{j6 in Course6} x6[i,j6] = 0 then "%s "),i; 

print     A B 0D 000H I J 0 

I believe that the printout should be      A B D H I J 

I do not see why 0 is printed if the sum is not zero (for C, E, F, G,
K). 

My Trainer set is    A B C D E F G H I J K. 

   Alan 


    Alan 



On 19/02/2011 21:40, Oscar Gustafsson wrote: 
> Alan, 
> 
> the following should work: 
> 
> printf{i in Trainer, j4 in Course4, j5 in Course5, j6 in Course6:
> x4[i,j4] + x5[i,j5] + x6[i,j6] = 0} ... 
> 
> Regards 
> 
> Oscar 
> 
> Andrew Makhorin skrev 2011-02-19 22:26: 
> > -------- Forwarded Message -------- 
> > From: Alan Zinober<address@hidden> 
> > To: address@hidden 
> > Subject: GLPK printing with if and iterative loop 
> > Date: Sat, 19 Feb 2011 17:27:04 +0000 
> > 
> > I need to print the Trainer names only when 
> > 
> >        x4[i,j4] + x5[i,j5] + x6[i,j6] = 0 
> > 
> > I declare: 
> > 
> > set Trainer;           different trainer names 
> > 
> > set Course4;         different course names 
> > set Course5;         different course names 
> > set Course6;         different course names 
> > 
> > var x4{Trainer, Course4}>=0, binary; 
> > var x5{Trainer, Course5}>=0, binary; 
> > var x6{Trainer, Course6}>=0, binary; 
> > 
> > 
> > Essentially I need a print statement with the logic of the code
> > below 
> > but do not know how to set up 
> > j4 iterated on Course 4, j5 iterated on Course5, j6 iterated on
> > Course6 : 
> > 
> > for {i in Trainer} 
> > 
> >        printf (if x4[i,j4 iterated on Course4] + x5[i,j5 iterated
> > on 
> > Course 5] 
> >                             + x6[i,j6 iterated on Course6] =0 then
> > "%s 
> > "),Trainer[i]; 
> > 
> >        Alan 
> > 
> > 
> > 
> > 
> > 
> > _______________________________________________ 
> > Help-glpk mailing list 
> > address@hidden 
> > http://lists.gnu.org/mailman/listinfo/help-glpk 
> 
> 
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