CALC expression

[Andrew Wagner <apwagner@u.washington.edu>]

Hey everyone, 

I need to evaluate a somewhat complicated conditional statement in a calc record. Presently I need to evaluate: 

 field(CALC, "(235>B && 5>D && 5>E) ? (B*0.00835 - 0.7 > A + (C-B)*0.25 ? B*0.00835 - 0.7: A + (C-B)*0.25): 0")

where the letters are input variables. When I load the record I get the error

Can't set "VOLT:PID.CALC" to "(235>B && 5>D && 5>E) ? (B*0.00835 - 0.7 > A + (C-B)*0.25 ? B*0.00835 - 0.7: A + (C-B)*0.25): 0"
Error at or before ")" in file "MagnetCtrlApp/Db/MagnetCtrl.db" line 113

Does CALC not support nested evaluations? Perhaps I need a subroutine record? Any advice would be greatly appreciated. 

Cheers, 

Andrew