I cannot add an algorithm in a comment on Recent tab

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I cannot add an algorithm in a comment on Recent tab

Last comment by - November 2015

I cannot add an algorithm in a comment on Recent tab

Cannot add algorithm in comment; posted to community but not on Recent tab.

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I cannot add an algorithm in a comment on Recent tab

Nicholas Stein | November 2015

Jack Handey asked for an algorithm with multiple signals. I was able to post to the community, but the attached project does not show up on the Recent tab.

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Nicholas Stein

November 2015

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John Rewolinski INVESTOR

November 2015

Hey that's great. So I'm not a great programmer, I see you are deriving the QuandlReader class from BaseData(). Does TradeBars also derive from BaseData()? Trying to figure out how the two are related I guess.

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Jared Broad INVESTOR

QuantConnect | November 2015

Thanks Nick, the recent tab is a highlight summary of the most popular and recent shared algorithms. Its too small to serve as a full forum but we just wanted to integrate the community with the IDE.

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Nicholas Stein INVESTOR

November 2015

@Jared Right! I figured as much. I just wanted to get the algorithm up to where people could see it because questions like this come up so often. @Jack I think QuandlReader is your class. Am I wrong? TradeBars do not exactly derive from BaseData. TradeBars is a collection derived from DataDictionary. TradeBar (singular) does derive from BaseData. That is to say QuantConnect.MarketData.DataDictionary is an implementation of the IDictionary interface. In C#, the is the Generic for a Type. A C# Dictionary is also known in other languages as a HashSet or a NameValueCollection. It is a collection of System.Types that is indexed by a key, that is often, but not necessarily, a string. So TradeBars, the parameter to OnData, is a collection of TradeBar objects and is indexed by a Symbol object. So you can refer to a TradeBar by saying TradeBar spy = data["SPY"] QuantConnect's Symbol automagically converts the string to a Symbol. You should look at the source code for TradeBar, TradeBars, DataDictionary, IDictionary, and Symbol in the source code. There you an see the properties and methods. That will give you a better feeling for these basic data types in QuantConnect (or any other algorithmic trading package for that matter). So if you have a custom data type, you can derive it from BaseData and BaseData will take care of the Time, Symbol and some other stuff for you. Michael has some great code using a custom class for BitCoin data and then getting that data from a custom web call. You should also be aware that Symbol has lately been revised by adding a SecurityIdentifer property called sid, so make sure you clone the latest Lean version from Github. The geniuses at QC have figured out a way to make that transparent so you can just use a string in place of the Symbol.

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