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Re: [Help-glpk] Printing only non-zero output

From: Andrew Makhorin
Subject: Re: [Help-glpk] Printing only non-zero output
Date: Mon, 3 Nov 2008 11:57:21 +0300

> 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.

> 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'];
> }

For example, like this:

printf "\nday\tadult\tchild\tsenior\n";
for {d in day : sum{t in ticket}buy[d,t]}
{  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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