Errors when invoking SetHoldings by Wink Saville

Wink Saville

edit

I ran into a situation where SetHoldings didn't create MarketOrder because CalculateOrderQuantity returned 0. CalculateOrderQuantity returned 0 because there had been no Securities[symbol].Price set. I ended up checking the Quantity for the Holdings after calling SetHoldings, something like:

if (securitesToPurchase > 0)

{

    SetHoldings("VCLT", 0.20m);

    var quantity = Securities["VCLT"].Holdings.Quantity;

    if (quantity > 0)

    {

        securtitiesToPurchase -= 1;

    }

    ....

}

Is there a better way to do this?

-- Wink

Update Backtest

4 Comments

Wink Saville

, ,

Accepted Answer

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Alexandre Catarino

From the code snippet, we cannot tell why the price of the security is zero. However, I can suggest that you verify whether the symbol is part of the TradeBars object:

public void OnData(TradeBars data) 

{

    /* ... */



    if (securitesToPurchase > 0 && data.ContainsKey("VCLT"))

    {

        SetHoldings("VCLT", 0.20m);

        var quantity = Securities["VCLT"].Holdings.Quantity;

        if (quantity > 0)

        {

            securtitiesToPurchase -= 1;

        }

        /* ... */

    }

}

After you call SetHoldings, the quantity can be zero if the call is made when the market is closed (e.g.: daily resolution algorithmns), because the order will only be executed on market open.

I hope this helps, otherwise you may need to share your code for the community take a look at it.

Wink Saville

267 ,

The reason why is because Price is 0 just for the reason you said, SetHoldings was called when the markets were closed, my start date was 1/1/2010. I've attached the code and here is the log and as you can see on the line " ... VCLT Price=0":

2010-01-01 00:00:00 Launching analysis for c187f74155f968f25c5c53522ad946b5 with LEAN Engine v2.2.0.2.744

2010-01-01 00:00:00 Initialize:+

2010-01-01 00:00:00 Initialzie: securitiesParamStrg=

2010-01-01 00:00:00 Initialize: SPY 0.25

2010-01-01 00:00:00 Initialize: VCLT 0.25

2010-01-01 00:00:00 Initialize:-

2010-01-04 10:00:00 OnData-Slice: SPY Price=112.8300

2010-01-04 10:00:00 OnData-Slice: Purchased Stock SPY 0.25% quantity=22

2010-01-04 10:00:00 OnData-Slice: VCLT Price=0

2010-01-04 10:00:00 OnData-Slice: Bad quantity VCLT 0.25% quantity=0

2010-01-04 10:00:00 OnData-Slice: SPY time=01/04/2010 09:00:00 open=112.3700 high=112.9400 low=112.3300 close=112.8300 volume=17467767 Value=112.8300

2010-01-04 11:00:00 OnData-Slice: SPY Price=113.1000

2010-01-04 11:00:00 OnData-Slice: VCLT Price=74.2100

2010-01-04 11:00:00 OnData-Slice: Purchased Stock VCLT 0.25% quantity=33

...

So my question is what's the best way to handle this, using Securities like I'm doing doesn't feel right?

Alexandre Catarino

For accessing each security new information, you should use the Slice (or TradeBars) object. So instead of using Securities[security.symbol].Price, use data.Bars[security.symbol], intead.
Before that, check whether the security was included in the Slice (or TradeBars) object. You can do something like this:

public override void OnData(Slice data)

{

    /* ... */



    // Only loop through my_security items 

    // which symbol are included in data

	foreach (var security in my_securities

        .Where(x => data.Bars.ContainsKey(x.symbol))

	{

        var symbol = security.symbol;

        var price = data.Bars[symbol].Price;

        /* ... */

    }

}

Wink Saville

267 ,

Thanks, that is much better! I tweaked the .Where statement so it would work for Ticks or Bars:

foreach (SecurityParam security in my_securities

			.Where(x => data.Bars.ContainsKey(x.symbol) || data.Ticks.ContainsKey(x.symbol)))

For anyone interested attached is the backtest with the .Where and other cleanup as well as defaulting to Resolution.Tick from 1/1/2010 to 1/5/2010.

Wink Saville

, , edit

Update Backtest

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