Annoying "Parameter value is 0 and not in the range" during GA optimization

[pel11]

Something I noticed, which should be trapped out by NT8 developers, is the fact that if you use an integer-based parameter during GA optimization, and compare the iterated value during optimization with a double-based cutpoint in an if-statement, NT8 will throw an exception (error) that the value of 0 was identified during an iteration. Specifically, in my case I was using an ADX threshold below which I would not trade in a strategy. The code that caused the error was:

[Range(4, 50), NinjaScriptProperty]
[Display(ResourceType = typeof(Custom.Resource), Name = "ADX threshold", GroupName = "NinjaScriptStrategyParameters", Order =6)]
public int adxthresh
{ get; set; }

and I was comparing adxthresh with

if ( adxlongterm < adxthresh )
entertrades=false;

where the DOUBLE class-level variable "adxlongterm" was set to adxlongterm = ADX(14)[0] in a bar update of a 5-minute data series.

However, when I changed adxthresh to double using the code:

public double adxthresh

the error stopped appearing. This indicates that NT8 does not like mixed integers and doubles, since NT8 was throwing an exception when an integer.

[NinjaTrader_ChrisL]

Hello pel11, thanks for your note.

This seems to be more of a run time issue with C# itself. If you need to adxthresh to be an int, you can cast it to a double when performing calculations with it, that should also solve this error.

e.g.
if ( adxlongterm < (double)adxthresh )

Best regards.