I'm attempting to test a strategy which creates a list and ranks the move of each symbol in a dataset, however if one of the symbols has no data the backtest breaks down and no trades are generated. Is there a way to skip the blank symbols ?

Here's the loop using GetExternalSymbol from my code..

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Sure there is:

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Thanks Eugene, I tried your suggestion and it still doesn't seem to be working for me. I get the error "Error processing symbol AAK:SS Attempting to Deserialize an empty stream"

Try this: "Runtime error: Attempting to Deserialize an empty stream."

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Thanks!

I'm getting a strange result. I have a symbol in my Yahoo! DataSet (COV) for which there is no data. If I run Cone's code, on another symbol in the DataSet for which there is Yahoo! data, ie. AA, I don't get any error. However, if the DataSet only contains COV, and I run it on that symbol, the Chart shows "No Data Available".

I coded this another way to try to figure out what is going on and got an even more bizarre result.

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When I run this against a Yahoo! DataSet containing only AA (which exists) and COV (for which there is no data), not only does the symbol COV print twice, but it also prints a unique High[0] and Bars.Count! I get the same result whether I run the Strategy against AA or COV.

Is it possible that WealthLab is finding the data for COV from another data provider?

Yes, the problem is that WealthLab is looking somewhere else and finding data for COV. I tried replacing COV in my DataSet with some letters that I was sure were not a symbol, and both Cone's and my code worked as expected.

How do I prevent WealthLab from looking somewhere other than in my YahooStaticProvider/Daily directory to try to find data for a symbol? I tried modifying Cone's code as follows:

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and get:

Bars(AA,Daily,0,13556)
Bars(NOTASYMBOL,Daily,0,0)

The GetExternalSymbol overload with DataSet name is the way to go. Then see my post #2.

Thanks. Here's my attempt to put this all together:

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Is there a more artful way to go through each symbol in the DataSet and only use the symbols for which data exists?

If I want to run this against more than one DataSet (which means I don't know the name of the DataSet), is there something I can replace "Yahoo" with that will cause it to only look at symbols in the current DataSet? I know the QuickReference says that doing this effectively is just specifying a data provider, but I'm concerned that this will result in a lot of computational overhead. If there are a lot of other Yahoo DataSets, does WealthLab have to search through each DataSet for the symbol, or is this just a directive to the YahooStaticProvider folder?

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If I want to run this against more than one DataSet (which means I don't know the name of the DataSet), is there something I can replace "Yahoo" with that will cause it to only look at symbols in the current DataSet?

You could use DataSetName for that e.g.

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I tried that, and I get "error CS0103@(17,31): The name 'DataSetName' does not exist in the current context"

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Sorry, I meant GetDataSetName. Assuming you've got Community Components installed, refer to it as simply this.GetDataSetName().

Thanks.

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