Divide By zero error

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I know this is a common problem, and i know the issue.
I just cant seem to solve it!

These are my equations

COTindexC = (CommNet - lowest(CommNet,per))/(highest(CommNet,per)-lowest(CommNet,per))*100;
COTindexS = (noncommNet - lowest(nonCommNet,per))/(highest(nonCommNet,per)-lowest(nonCommNet,per))*100;
COTindexL = (specNet - lowest(specNet,per))/(highest(specNet,per)-lowest(specNet,per))*100;

clearly one of the values is coming up at zero, but how do i create an alternative variable if its zero so that its some obsolete number that will bypass the error.

Ive attached the the full script below...

Thanks in advance for whoever takes the time to help.

Best,
Simon

input: FuturesOnly_Or_FuturesAndOptions_1_or_2( 1 ),per(10) ;

variables:

Initialized( false ),
FieldNamePrefix( "" ),
CommLongFieldNme( "" ),
CommShortFieldNme( "" ),
NonCommLongFieldNme( "" ),
NonCommShortFieldNme( "" ),
SpecLongFieldNme( "" ),
SpecShortFieldNme( "" ),
CommLong( 0 ),
oCommLongErr( 0 ),
CommShort( 0 ),
oCommShortErr( 0 ),
NonCommLong( 0 ),
oNonCommLongErr( 0 ),
NonCommShort( 0 ),
oNonCommShortErr( 0 ),
SpecLong( 0 ),
oSpecLongErr( 0 ),
SpecShort( 0 ),
oSpecShortErr( 0 ),
CommNet( 0 ),
NonCommNet( 0 ),
SpecNet( 0 ) ;

var: COTIndexC(0), COTIndexS(0), COTIndexL(0);

if Initialized = false then
begin
if Category > 0 then
RaiseRuntimeError( "Commitments of Traders studies can be applied only to" +
" futures symbols." ) ;
Initialized = true ;
FieldNamePrefix = IffString( FuturesOnly_Or_FuturesAndOptions_1_or_2 = 1,
"COTF-", "COTC-" ) ;
CommLongFieldNme = FieldNamePrefix + "12" ;
CommShortFieldNme = FieldNamePrefix + "13" ;
NonCommLongFieldNme = FieldNamePrefix + "9" ;
NonCommShortFieldNme = FieldNamePrefix + "10" ;
SpecLongFieldNme = FieldNamePrefix + "16" ;
SpecShortFieldNme = FieldNamePrefix + "17" ;
end ;

CommLong = FundValue( CommLongFieldNme, 0, oCommLongErr ) ;
CommShort = FundValue( CommShortFieldNme, 0, oCommShortErr) ;
NonCommLong = FundValue( NonCommLongFieldNme, 0, oNonCommLongErr ) ;
NonCommShort = FundValue( NonCommShortFieldNme, 0, oNonCommShortErr );
SpecLong = FundValue( SpecLongFieldNme, 0, oSpecLongErr ) ;
SpecShort = FundValue( SpecShortFieldNme, 0, oSpecShortErr ) ;

if oCommLongErr = fdrOk and oCommShortErr = fdrOk then
begin
CommNet = CommLong - CommShort ; //commercials
end ;

if oNonCommLongErr = fdrOk and oNonCommShortErr = fdrOk then
begin
NonCommNet = NonCommLong - NonCommShort ;//large traders
end ;

if oSpecLongErr = fdrOk and oSpecShortErr = fdrOk then
begin
SpecNet = SpecLong - SpecShort ; //small speculators
end ;

Plot1( cotindexC, "Comm" ) ;
//SetPlotColor(1,darkcyan );
Plot2( cotindexL, "Large" ) ;
//SetPlotColor(2, green);
Plot3( cotindexS, "Small" ) ;
//SetPlotColor(3, red);

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Wow thanks for this gem!

In regards to the error, I solved just using an iff statement to check whether the denominator is zero.

COTindexC = iff((highest(CommNet,per)-lowest(CommNet,per)) = 0, 0, (CommNet - lowest(CommNet,per))/(highest(CommNet,per)-lowest(CommNet,per))*100);
COTindexS = iff((highest(nonCommNet,per)-lowest(nonCommNet,per)) = 0, 0, (noncommNet - lowest(nonCommNet,per))/(highest(nonCommNet,per)-lowest(nonCommNet,per))*100);
COTindexL = iff((highest(specNet,per)-lowest(specNet,per)) = 0, 0, (specNet - lowest(specNet,per))/(highest(specNet,per)-lowest(specNet,per))*100);

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Divide By zero error

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