Market trading rules

This function accepts a list of rules and an index as parameters and returns a rule for the specified index.
The Market trading rules function can be very useful when applied in an optimization or backtesting process. Imagine you have a trading system and you would like to test different exit strategies. You first need to compile a list of rules that will be used as exits.
Let us say, these are your exit rules:
rsi(14) < 30
roc(close, 2) < -10
sma(volume, 30) < sma(volume, 10)
close < ref(close, 1) && ref(close, 1) < ref(close, 2)

And this is your trading system:
buy = sma(30) > sma(14) && roc(close, 20) < -10 && roc(close, 2) > 3;
sell = ??

Because you have four exit rules, you would like to test four strategies. You can of course create a trading system for each exit rule or you can use this market trading rules function and only one trading system to accomplish the same result. The usefulness of this function may not seem obvious with this example, however if you had more than 20 exit rules to test then this function will save you a lot of time.
Here is a trading system based on the market trading rules function:
Optimize("varindex", 0, 3, 1);
buy = sma(30) > sma(14) && roc(close, 20) < -10 && roc(close, 2) > 3;
sell = rules_select("rsi(14) < 30;roc(close, 2) < -10;sma(volume, 30) < sma(volume, 10);close < ref(close, 1) && ref(close, 1) < ref(close, 2)", varindex);

When you optimize this strategy, the variable 'varindex' will varies from 0 to 3 and this in turn will create 4 strategies.

You can also use this function to create more variations and combinations. Instead of using the function once, you can use it several times, each time with the same rules or different ones. This will create several combinations.
Example:
Optimize("varindex1", 0, 2, 1);
Optimize("varindex2", 0, 1, 1);
s1 = rules_select("rule1;rule2;rule3", varindex1)
s2 = rules_select("rule4;rule5", varindex2)
sell = s1 || s2;

The above example will create six strategies. You can calculate the number of combinations by multiplying the number of iterations in every function (3 * 2 = 6).
Here is the list of all the generated trading rules combinations:
sell = rule1 || rule4;
sell = rule1 || rule5;
sell = rule2 || rule4;
sell = rule2 || rule5;
sell = rule3 || rule4;
sell = rule3 || rule5;

The rules passed to the Market trading rules function must be separated by a semi-colon and must be entered as a string (between quotes).

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