Stuck with MIN function in ninjascript

[crystalet]

I am looking to define a variable which is the minimum of all bars, except the current one (over a lookback period)

int Lookback = 10
double minvalue = MIN(Low, Lookback)[1];

but this throws an error

System.ArgumentOutOfRangeException
HResult=0x80131502
Message=Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
Source=mscorlib
StackTrace:
at System.ThrowHelper.ThrowArgumentOutOfRangeExceptio n(ExceptionArgument argument, ExceptionResource resource)
at NinjaTrader.NinjaScript.Series`1.get_Item(Int32 barsAgo)
at NinjaTrader.NinjaScript.NinjaScriptBase.get_Item(I nt32 barsAgo)
...
at NinjaTrader.NinjaScript.NinjaScriptBase.Update(Int 32 idx, Int32 bip)

I checked and only Low[0] and Low[1] exist, Low[2] hasnt been formed when this error occurs.

But Low.Count is 1040 (although in the Watch Window, under Low, Count actually says zero)

How can I check myself if the data has enough values to use this method?

[crystalet]

Just tested the same code on an empty chart and it worked just fine. I think it has to do with another indicator that was working with multiple time frames. Not sure how to fix it yet

[NinjaTrader_Jesse]

Hello crystalet,

Thank you for the post.

You could use CurrentBar as the Lookback if you wanted all bars, CurrentBar is the processing bars index. If you are on bar 2 CurrentBar will equal 2 and the MIN would see that as the MIN of the 2 bars.

double minvalue = MIN(Low, CurrentBar)[1];

The [1] BarsAgo would be correct to get the 1 BarsAgo value from now or minus the current bar. The CurrentBar increments for each new bar. You would very likely need to add a condition if(CurrentBar < 1) return; because you used 1 BarsAgo here

Alternatively to check that enough bars are available for the Lookback you would do:

int Lookback = 10;
if(CurrentBar < Lookback) return;
double minvalue = MIN(Low, Lookback)[1];

I look forward to being of further assistance.

[crystalet]

Brilliant - that worked!!!