Re:Message pops up say can't divide by zero

["Sentinel Trading" <rjbiii@xxxxxxxxx>]

What is the function $Upperband, and $Lowerband. That is probably where the
problem lies.

"The darkest hour in any man's life is when he sits down to plan
 how to get money without earning it"

Sentinel Trading
rjbiii@xxxxxxxxx

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Subject: Message pops up say can't divide by zero
Author: Robert W Cummings
Date:  8/27/98 8:06 PM

Input: Price(C),Length(18),SDev(2),upper(100),Lower(-100);
Plot1(((100*(Price-$Lowerband(Price,Length,SDev))/($Upperband(Price,Length,S
Dev)-$Lowerband(Price,Length,SDev)))-50)*2,"Place");

Plot2(upper,"Upper");
Plot3(lower,"Lower");
IF CheckAlert Then Begin
  IF Plot1 Crosses Above Plot2 or Plot1 Crosses Below Plot2
  or Plot1 Crosses Above Plot3 or Plot1 Crosses Below Plot3
  or Plot2 Crosses Above Plot3 or Plot2 Crosses Below Plot3
  Then Alert = TRUE;
End;

Can't figure what its needs without messing up what the original author was
attempting to do here.
Anybody see the problem it will verify.

Thanks in Advance

Robert