I am trying to create a stop loss that calculates the highest closing price since purchasing a stock.  The stop loss works provided that the stock has been going up, however if the purchase price is less than a high x times ago before purchase date it calculates the stop based on that high. 

 

The issue is that I calculated the number of bars between purchase date and today, I then do a highest.  But as the highest starts from the day of purchase it then ends up going back x number of bars before purchase.  I tried to make the bar value adjust based on the NOW which should be the bar being processed but Bullcharts returns and error which is "Error905: Object reference not set to an instance of an object.  If I replace the BARS variable in the highest function with a number then error goes away but indicator returns wrong values.

 

To see this exact problem use WOW on a weekly and set the number to replace BARS as 32, the indicator has the defaults set for the rest of the values which should work.

 

Any help on this would be aprreciated.

 

Thanks

[Target=Price; Author=Rickaby; Period=Weekly; Category=Stop Loss; Description="Used to have trailing stop loss based on the number of shares purchased and how much money to risk. Calculates stop loss based on highest weekly close since purchased. Need to select 'This indicator is relevant to this security' only in the advanced tab when creating." ]

Dataarray:=input("Enter Type. 1=o, 2=h, 3=l, 4=c", 4, 1, 4);

Value2:=If(Dataarray=1,O, If(Dataarray=2,H, If(Dataarray=3,L, C)));

Dollar:= input("Enter MAX dollar loss", 500, 1, 10000);

Noshares:=input("Enter number shares", 291, 1, 500000);

Purchasedate:=inputdate("Purchase Date",date(2009,03,24));

Bars:=if(now>Purchasedate, datediff("W", Purchasedate, now) ,0);

Highvalue:=if(now>Purchasedate,Highest(Value2,Bars),undefined);

Stoploss:=Highvalue-(Dollar/Noshares);

[color=red; linestyle=dotted; width=2]

if (now>Purchasedate,Stoploss,undefined);

[color=blue; linestyle=Bar; width=1]

if(OnOrSkipped(Purchasedate),h,undefined);

function of the last bar in the chart and then render any value or indicator :)

 

[Target=Price; Author=Rickaby, Kim; Period=Weekly; Category=Stop Loss; Description="Used to have trailing stop loss based on the number of shares purchased and how much money to risk. Calculates stop loss based on highest weekly close since purchased. Need to select 'This indicator is relevant to this security' only in the advanced tab when creating." ]

Pricetype:=expression("Enter Tpye. O,H,L,C",c);

Dollar:= input("Enter MAX dollar loss", 500, 1, 10000);

Noshares:=input("Enter number shares", 1, 1, 500000);

Purchasedate:=inputdate("Purchase Date");

Bars:=lastvalue(barnumber)- datediff("W", Purchasedate, systemdate)-1;

Startofweek:=if(dayofweek(Purchasedate)=1,Purchasedate, dateadd("d",-dayofweek(Purchasedate)+1, Purchasedate));

Highvalue:=if(barnumber>=Bars, highest(Pricetype, barnumber-Bars), hist(c,Bars));

Stoploss:=Highvalue-(Dollar/Noshares);

[color=red; linestyle=dotted; width=2; Name=Stoploss]

if (now>=dateadd("w",-1, Purchasedate), Stoploss, undefined);

[color=blue; linestyle=Bar; width=1; Name=Purchasedate]

if(onorskipped(Startofweek), L, undefined);