Cannot implicitly convert type 'WealthLab.Indicators.ROC' to 'double'

Author: KevinA

Creation Date: 5/20/2012 2:34 AM

Wealth Lab » WealthScript (.NET) » Cannot implicitly convert type 'WealthLab.Indicators.ROC' to 'double'

KevinA

5/20/2012 2:34 AM

I'm new to C# and WLP so I'd appreciate some help here in figuring this out...

I'm trying to code a simple screener, sorting the dataset by the highest ROC and then dumping the sorted list of symbols and their corresponding ROC values ... somewhere. I haven't gotten to the somewhere part yet as I'm stuck when I try to use ROC.Series to assign its computed value to the pointer holder.roc. The compiler gives me this error msg: error CS0029 @ (47,19): Cannot implicitly convert type 'WealthLab.Indicators.ROC' to 'double'. I understand the msg, I just don't know what to do despite having read everything I can reasonably find on this site and the programming guide about screeners.

I used the Symbol Rotation code as the basis for this. Any help would be appreciated. Thanks.

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I'm new to C# and WLP so I'd appreciate some help here in figuring this out...

I'm trying to code a simple screener, sorting the dataset by the highest ROC and then dumping the sorted list of symbols and their corresponding ROC values ... somewhere. I haven't gotten to the somewhere part yet as I'm stuck when I try to use ROC.Series to assign its computed value to the pointer holder.roc. [u]The compiler gives me this error msg: error CS0029 @ (47,19): Cannot implicitly convert type 'WealthLab.Indicators.ROC' to 'double'[/u]. I understand the msg, I just don't know what to do despite having read everything I can reasonably find on this site and the programming guide about screeners.

I used the Symbol Rotation code as the basis for this. Any help would be appreciated. Thanks.

[CODE]using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using WealthLab;
using WealthLab.Indicators;
 
namespace WealthLab.Strategies
{
	public class iHolder
	{
		internal string symbol;
		internal double roc;
	}
	
	public class StrongROCRotation : WealthScript		
	{
		public int Compare(iHolder item1, iHolder item2)
		{
			return item1.roc.CompareTo(item2.roc);
		}
		
		private StrategyParameter rocPeriod;
		
		public StrongROCRotation()
		{
			rocPeriod = CreateParameter("ROC Period", 63, 5, 65, 2);
		}		
		
		protected override void Execute()
		{
			//Clear cached symbol list so they can be re-requested with synchronization
			ClearExternalSymbols();
			int Period = rocPeriod.ValueInt;
			
			//Create list for screened securities
			List<iHolder> list = new List<iHolder>();
			list.Clear();
			
			//Build the list of symbols and price performances
			foreach(string symbolx in DataSetSymbols)
			{
				SetContext(symbolx, true);
				{
					iHolder holder = new iHolder();
					holder.symbol = symbolx;
					[b]holder.roc = ROC.Series(Bars.Close, Period);[/b]				
					list.Add(holder);
				}
				RestoreContext();
			}
				
			list.Sort(Compare);
			// Instead of Bottom-N, deal with Top-N symbols:
			list.Reverse();
			
//then print somewhere ....

}
	}
}
[/CODE]

Eugene

5/20/2012 2:58 AM

Welcome to the community forums.

To get rid of the error you probably need to change this line...

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...this way:

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Eugene

5/20/2012 3:02 AM

For printing somewhere, you can start from the Debug window: PrintDebug. QuickRef for more (hit F11).

KevinA

5/20/2012 3:10 AM

Now that's what I call service ... at 3am in the morning :)

I deleted the '[bar]' from the original code which still works in the full backtest version. In this version, there was no need for it but I think you are suggesting I use a for loop instead of foreach and using a counter called bar ? I don't need it to calculate ROC for all the bars, just the most current or recent one when the script is run.

Thanks very much for the response
K