Quantstrat useRs,

I have a number of questions about how to use quantstrat that I have accumulated since I have begun playing with it.  First, can the orderqty be dynamic?  All of the examples I have seen are based on placing an order for 100 shares when a rule is triggered.  Is it possible to set it up to buy the maximum number of shares given the starting or current equity?  Similar to that question, I think most examples buy 100 shares each time a buy is triggered?  Is it possible to make the rules only buy at the first buy trigger?  So the fund is either long 100% equity or in cash for a fixed starting equity.

Another idea I would like to try to implement is a slow trading strategy where you have to keep a position for at least x days after a buy.  For example some small cap or international funds have a penalty for trading in and out too quickly.  It would be nice to test how much such a restriction hurts you?

My final question is how to create a rule that uses more than one signal.  Here I have an code sample below.  In the sample I add three moving averages, ma50, ma160, and ma200:


        #Adding indicators to a strategy
        stratName <- add.indicator(strategy = stratName, name = "SMA", arguments =
        list(x=quote(Cl(mktdata)), n=50),label= "ma50" )
        stratName <- add.indicator(strategy = stratName, name = "SMA", arguments =
        list(x=quote(Cl(mktdata)), n=160),label= "ma160")
        stratName <- add.indicator(strategy = stratName, name = "SMA", arguments =
        list(x=quote(Cl(mktdata)), n=200),label= "ma200")

        #Adding signals to a strategy
        stratName <- add.signal(strategy = stratName,name="sigCrossover",arguments =
        list(columns=c("ma50","ma160"), relationship="gte"),label="ma50.gt.ma160")
        stratName <- add.signal(strategy = stratName,name="sigCrossover",arguments =
        list(column=c("ma50","ma160"),relationship="lt"),label="ma50.lt.ma160")

        stratName <- add.signal(strategy = stratName,name="sigCrossover",arguments =
        list(columns=c("ma50","ma200"), relationship="gte"),label="ma50.gt.ma200")
        stratName <- add.signal(strategy = stratName,name="sigCrossover",arguments =
        list(column=c("ma50","ma200"),relationship="lt"),label="ma50.lt.ma200")


How would I modify the rules below to enter when ma50 greater than both ma160 and ma200 and exit when ma50 is below both ma160 and ma200?

        #Add rules to a strategy
        stratName <- add.rule(strategy = stratName,name='ruleSignal', arguments =
        list(sigcol="maFast.gt.maSlow",sigval=TRUE, orderqty=100, ordertype='market', orderside='long'),type='enter')
        stratName <- add.rule(strategy = stratName,name='ruleSignal', arguments =
        list(sigcol="maFast.lt.maSlow",sigval=TRUE, orderqty='all', ordertype='market', orderside='long'),type='exit')

Thanks to everyone who helped develop quantstrat and blotter,

Roger


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