title: Unknown GW-BASIC function/syntax: Q(var) = var
body: <p>I'm translating an excessively old GW-BASIC program into JavaScript, and I've come across a piece of syntax that has me stumped.  Note (again): totally not my code, and the variable names are all insane, which is why I'm porting it in the first place.</p>
  
  <pre><code>1380 Z = 1
  1390 RATIO = FCO2 /(1-FCO2-10^REFFO2)
  1400 AA =(1 - 2*RATIO*(100 / MIXRATIO - 1))/(1 + 2*(100 / MIXRATIO - 1))
  1410 PART = LOG(1 - AA)- LOG(100 / MIXRATIO - 1)
  1420 FOR I = 1 TO - 1 STEP -2
  1430 H = I
  1440 W = T + H 
  1450 GG = 62.110326# - .02144446#*W + 4.720326E-07*(W^ 2)+(- 4.5574288#)*(10^(- 12))*(W^ 3)- 7.343018200000001#*(10^(- 15))*(W^ 4) 
  1460 KK = EXP(- GG /(R*(W + 273.18)))
  1470 Q(Z)= KK 
  1480 Z = Z + 1
  1490 NEXT I
  1500 NEWFO21 = LOG(10)*.5*(LOG(Q(1))+ PART):NEWFO22 = LOG(10)*.5*(LOG(Q(2))+ PART)
  1510 DELEMFDELT =(FN EMF (TREF + 1,NEWFO21) - FN EMF (TREF - 1, NEWFO22))/2
  1520 RETURN
  </code></pre>
  
  <p>The question mark is line <code>1470: Q(Z) = KK</code>. <code>Q</code> is defined <code>Q$</code> earlier in the program as a yes/no input variable, so it makes no sense for me to be putting a float in it.  There's no <code>Q()</code> function defined in the program earlier, and I can't find a reference to a <code>Q()</code> function in GW-BASIC, either.  </p>
  
  <p>Any help?</p>