[amibroker] Newbie Custom Indicator Question

["cgrafham" <chris@xxxxxxxxxxxxxxxx>]

I have written the following well-known indicator and saved it in the "Custom" folder as 
"Elder Bull Power.afl"


function ElderBullPower( period )
{
  return High - EMA(Close, period);
}


Plot( ElderBullPower(  Param("Period", 20, 1, 100 ) ),_DEFAULT_NAME(), ParamColor("Color", 
ColorCycle ),  styleNoTitle | ParamStyle("Histogram style", styleHistogram | styleNoLabel, 
maskHistogram ) );



I am having difficult using this indicator as part of system written in a differnet formula 
file in the Systems folder.


I get a syntax error when using the below:

Buy = ElderBullPower(20) < 0;


It appears that the function is not known.

This is my attempt at wriing a custom indicator and using it as part of system, so I'm sure 
I'm missing something fundemental...

Can any one see a problem?









------------------------------------

Please note that this group is for discussion between users only.

To get support from AmiBroker please send an e-mail directly to 
SUPPORT {at} amibroker.com

For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
http://www.amibroker.com/devlog/

For other support material please check also:
http://www.amibroker.com/support.html
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/amibroker/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/amibroker/join
    (Yahoo! ID required)

<*> To change settings via email:
    mailto:amibroker-digest@xxxxxxxxxxxxxxx 
    mailto:amibroker-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
    amibroker-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/