$setglobal gp_term emf

sets
scenario     Scenarios     /Tractor,Combine,Trailer/,
obsrvation   Observations  /1*12/,
item         Items         /price,quantity/;

PARAMETER
example(scenario,obsrvation,item)
;


example(scenario,obsrvation,"price")
 = ord(obsrvation)+20-ord(scenario);
example(scenario,obsrvation,"quantity")
 = ord(obsrvation);


$setglobal gp_lwidth 10
$setglobal gp_lc_1 black
$setglobal gp_lc_2 cornflowerblue
$setglobal gp_lc_3 yellow

$setglobal gp_fixcolor_set scenario
$setglobal gp_title "All set elements are active"
$libinclude gnuplotxyz example quantity price

example("Combine",obsrvation,item)  = 0;

$setglobal gp_title "COMBINE is inactive, color fixing is switched on"
*$libinclude gnuplotxyz example quantity price

$setglobal gp_fixcolor_set no
$setglobal gp_title "COMBINE is inactive, color fixing is switched off again"
*$libinclude gnuplotxyz example quantity price