"Cannot apply indexing with..." error

[ulisesguerrero]

Hello,

I'm developing a simple indicator that uses muti-timeframe data. These lines fail to compile:

double lo = Lows[1][1];
double hi = Highs[1][1];
double op = Opens[1][1];
double cl = Closes[1][1];

The two lines with Opens and Closes work, while Highs and Lows don't. Why could this be?

The error is: " Cannot apply indexing with [] to an expression of type 'double' "

Thanks
Ulises

[NinjaTrader_ChelseaB]

Hello Ulises,

Welcome to the NinjaTrader forums!

Are you certain this code is the code causing the error?

The error indicates that a double (and not a series) has an index applied.

For example Low (singular) is series of doubles. Lows (plural) is a collection of series.

Lows[1][1] <- this would not cause an error
Low[1][1] <- this would cause an indexing order

if (Lows[1] == 15) <-- this would cause an error that the operator is invalid (because they are not like types)
if (Low[1] == 15) <- this would not cause an error

I've copied the exact code you have posted into a script and this is not causing an error on my end.

[ulisesguerrero]

Thanks for the welcome. Glad to get a quick reply.

I did copy the code into a new indicator, and it worked fine. Then I figured that one of the properties created in the wizard was called "Highs" and "Lows" (was hidden with the + icon):

#region Properties

[Browsable(false)]
[XmlIgnore]
public Series<double> Highs
{
get { return Values[0]; }
}

[Browsable(false)]
[XmlIgnore]
public Series<double> Lows
{
get { return Values[1]; }
}

[Browsable(false)]
[XmlIgnore]
public Series<double> Open
{
get { return Values[2]; }
}

[Browsable(false)]
[XmlIgnore]
public Series<double> Close
{
get { return Values[3]; }
}
#endregion


So, I guess it would be good to reject system names/labels when using an indicator or strategy wizard.

Thanks! Problem solved!