RE: [amibroker] Problem with using "function" in AFL

Sat, 27 May 2006 15:59:34 -0700

I'm can't explain why it works one way and not the other.

This code give a compile error at this line:

Buy = Buy_Cond1;

The reason is Buy_Cond1 is undefined because it is inside a function and
is local to that function.

Add this line as the last line of your function:
    return Buy_Cond1:

Then change your function call to:

    Buy = rule1(10,1.5,1.005);
--
Terry
-----Original Message-----
From: [email protected] [mailto:[EMAIL PROTECTED] On
Behalf Of soundscribe_studios
Sent: Saturday, May 27, 2006 15:24
To: [email protected]
Subject: [amibroker] Problem with using "function" in AFL

I need to call a function with parameters, but for some reason I can't
get it to work when using the variables passed into the function. In
the code below, if I explicitly set the variable values, the function
works fine -- executing about 80 trades. If I have them commented out
(and the passed in values are used), the system doesn't execute any
trades. I make no other changes.

I've plotted the values when passed in and they appear to be correct.
What am I missing here? This is AB 4.80.1 although it behaves the same
on older versions as well.

What's also odd is if I plot the "Buy" array, it looks exactly the
same whether or not the variables are explicitly set -- just no trades
get executed when the passed in values are used. At a loss here...

/////////////////////////////////
... some code to read from a file ...

function rule1(aver,width,percent)
      {

//aver =10;
//width=1.5;
//percent=1.005;

      Bbot = BBandBot(Close,aver,width);
      Buy_cond1 = Close < BBot /percent;
      BuyPrice = Close;
}

if (p11 = 1)
{
//rule1(p12,p13,p14);
rule1(10,1.5,1.005);
}


.... some other code -- nothing touching Buy_cond1 or Buy ....


entrybar = -1;

//Buy = Buy_cond1 AND Buy_cond2 AND Buy_cond3;
Buy = Buy_cond1;

// exit code

for( i = 0; i < BarCount; i++ )
      {
      if( entrybar == -1 AND Buy[ i ] )
            {
            entrybar = i;
            }

      if( entrybar != -1 AND i > entrybar AND Close[ i ] > Close[
entrybar
]+0.02 OR i-entrybar>=20 )
            {
            Sell[ i ] = 1;
            SellPrice[ i ] = Close[ i ];
            entrybar = -1;
            }
      else
            {
            Sell[ i ] = 0;
            }
      }







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