[Help-glpk] Printing only non-zero output

[BruceM]

Hi,
I'm a complete newbie to GLPK, but have battled through much of the early
learning over the past week.
I'm now trying to print my output in a sensible way - specifically, in the
code below I want to print only days where I have bought something.
As it is, I have commented out the bit where I tried to make it only print
days where I buy something, so the model works, but it doesn't do what I
want.
If I un-comment out that line, it says "invalid use of reserved keyword if"

Can someone please tell me how I should make GLPK do what I want it to do.

Many thanks,
Bruce.

printf "\nday\tadult\tchild\tsenior\n";
for {d in day}:
      #if sum{t in ticket}buy[d,t] then
        {printf "%d\t%4.2f\t%4.2f\t%4.2f\n",d, 
         buy[d,'adult'], buy[d,'child'], buy[d,'senior'];
        }
-- 
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