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Hello all,
This is my first post to your group. I'm currently exploring the
capabilities of this program prior to buying. I've taken the AFL
Function Reference list and merged it together from what I have
available. The resulting file is in the files section of the mail
list.
http://groups.yahoo.com/group/amibroker/files/AFL%20Function%
20Reference%201.0%20to%201.4.htm
I inserted the new AFL's I found below as well.
Happy trading All
Brett
--- In amibroker@xxxx, rasnitsyn@xxxx wrote:
> Hi Tomasz!
>
> Thank you very much! Great job!
>
> These new functions are extremely useful, especialy for coding of
the
> trading systems. I've made my huge AFL files 10-15% smaller (and
> found one bug :-) replacing my proprietary code by your new methods!
>
> I have one minor request. Right now AmiBroker AFL help lists AFL
> methods by versions. It's inconvenient a bit. Is it possible to
merge
> them all together?
>
> Thank you,
> Dima.
>
>
> --- In amibroker@xxxx, "Tomasz Janeczko" <tj@xxxx> wrote:
> > Hello,
> >
> > The next issue of the newsletter will cover all new functions in
> AFL but
> > let me now explain shortly a couple of them:
> >
> > NOTE: all these functions are available ONLY in v 3.52 (and
above :-
> ))
> > =====================================================
> >
> > StrLen( String ) function
> > ====================
> > - calculates the length of the string.
> > This function could be used for (for example) filtering out only
3
> letter stock codes:
> >
> > buy = something AND strlen( name() ) == 3;
> >
> >
> > AMA( Array, SmoothingFactor ) function
> > =============================
> > - calculates adaptive moving average - simliar to EMA but
> > smoothing factor could be time-variable (array).
> > The example of volatility-weighted adaptive moving average
formula:
> >
> > graph0 = ema( close, 15 );
> > fast = 2/(2+1);
> > slow = 2/(30+1);
> > dir=abs(close-ref(close,-10));
> > vol=sum(abs(close-ref(close,-1)),10);
> > ER=dir/vol;
> > sc =( ER*(fast-slow)+slow)^2;
> >
> > graph0 = ama( close, sc );
> >
> >
> > Study( StudyID, ChartID = 1 ) function
> > =======================
> > - generates an array equivalent to a trendline study drawn
> > by the user - allows detecting trendline breakouts from AFL
> > - more details will be given in a newsletter
> >
> >
> > ExRem( Array1, Array2 ) function
> > ========================
> > - removes excessive signals:
> > returns 1 on the first occurence of "true" signal in Array1
> > then returns 0 until Array2 is true even if there are "true"
> signals in Array1
> >
> > Example:
> > buy = ExRem( buy, sell );
> > sell = ExRem( sell, buy );
> >
> >
> > Flip( Array1, Array2 ) function
> > ======================
> > - works as a flip/flop device (electronic/electric engineers will
> know what I mean)
> > - returns 1 from the first occurence of "true" signal in Array1
> > until a "true" occurs in Array2 which resets the state back to
zero
> > unil next "true" is detected in Array1...
> >
> > IsEmpty( Array ) function
> > ===================
> > - returns 1 (or 'true') when given point in array is {empty}
> > Note: {empty} value is used internaly by AFL to mark
> > bars when the value is not available - for example for the first
> > 20 bars the value of 20-day simple moving average is not available
> > ({empty})
> >
> >
> > IsTrue( Array ) function
> > ==================
> > returns 1 (or 'true') when given point is not {empty} AND not zero
> >
> >
> > Foreign( Ticker, DataField )
> > =====================
> > - allows referencing other (than current) tickers in the AFL
> formulas.
> > Allowable data
> fields: "open", "close", "high", "low", "volume", "interest"
> > Provides an easy way to implement overlays, as shown in the
> > following code:
> >
> > /* Red line - current security price */
> > /* Blue line -overlaid index chart (scaled to fit) */
> >
> > graph0 = close;
> > graph1 = foreign( "XAO", "Close" ) ;
> > /* replace "XAO" by your index, or any other ticker to graph
along
> with you stock */
> >
> > graph1 = lastvalue( highest( graph0 ) )/ lastvalue( highest(
> graph1 ) ) * graph1;
> >
> >
> >
> > Best regards,
> > Tomasz Janeczko
> > ===============
> > AmiBroker - the comprehensive share manager.
> > http://www.amibroker.com
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