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Yes it is possible but you need to include definition of the
function using #include
command. Simple solution is to create MyFunctions.afl file
where you will put ALL your functions, save it into "Include"
folder
and then you will be able to reference it using
#include <MyFunctions.afl>
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
Sent: Wednesday, January 30, 2008 4:23
AM
Subject: [amibroker] Calling your own
functions
I am evaluating AmiBroker at the moment, but can't figure out
whether the following is possible. I want to create a new function that can be
called from within a formula and used for backtesting. Just as if you were to
call, say, the inbuilt MACD or Chaikin functions.
Just to test if it
were possible, I grabbed a function from the manual and saved it as a new
formula:
function IIR2( input, f0, f1,
f2 )
{
result[ 0 ] = input[ 0 ];
result[ 1 ] = input[ 1 ];
for( i
= 2; i < BarCount; i++ )
{
result[ i ] = f0 * input[ i ] +
f1 *
result[ i - 1 ] +
f2 * result[ i - 2 ];
}
return
result;
}
Then I created a new formula to call this function
from, again just copying straight from the manual:
Plot( Close, "Price", colorBlack, styleCandle
);
Plot( IIR2( Close, 0.2, 1.4, -0.6 ), "function example", colorRed
);
Amibroker complains about the second line:
Ln: 2, Col: 11: Error 31. Syntax error, expecting
')' or ','
Any idea what's going on? Do I have to compile the
function or something like that? (If so, how do I?).
My second question
is whether we can get access to the source of the inbuilt functions so that I
can learn how to create my own that can be called from backtesting. I'd
like to be able to do the following:
Buy=Cross(myfunction(xyz), 5);
But I'm not sure how to write
the function so it can be used like this. If we can't get the source,
then does anyone have any hints on how to convert a custom indicator to a
function?
Many thanks in
advance!
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