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AmiBroker is working just fine.
We've just been answering the wrong question. All samples provided so
far have been to tell you the number of times *for each stock* your
criteria was met over the given period. None of the examples
attempted to calculate the number of rows returned by the exploration
or the number of stocks that met the crieria.
What exactly is your intention? If you just want to output the number
of rows, use the AddSummaryRows function.
AddSummaryRows(16);
If you want to know how many stocks met your criteria, use the
AddToComposite function. However, you cannot both calculate using
AddToComposite and display using AddColumn in a single pass. So, you
would have to run your Exploration twice to see the result of the
first run.
You can also Plot the composite if you want to see how it changes
over time. The complete guide to composites can be found here:
http://www.amibroker.net/3rdparty/IntroToAtc.pdf
AddToComposite(m, "~Counter", "X", atcFlagDefaults |
atcFlagEnableInExplore);
Plot(Foreign("~Counter", "Close"), "Counter", colorRed, styleLine);
AddColumn( Open, "Open" );
AddColumn( cumResult, "Cum" );
AddColumn( sumResult, "BarIndex" );
AddColumn( loopResult, "Looping" );
AddColumn( Foreign("~Counter", "Close"), "Count" );
AddSummaryRows(16);
Mike
--- In amibroker@xxxxxxxxxxxxxxx, "bigitop" <doctormuniz@xxx> wrote:
>
>
> I totally understand the logic of your example. it should work in
theory
> however in reality it is not. When i run this for a given date
range,
> let's say 1/14/09 - 1/16/09, all three values (cumResult, sumResult
and
> loopResult) are returning the number of days in the date range
selected
> in AA window. So all three are returning 3. However, the number
stocks
> with the 40-60 price range in this 3-day period is 150. I can't
see why
> your example wouldn't work. I can't see why the other examples
provided
> by other forum members wouldn't work. But they just are not working.
>
> Im so frustrated. This is such a simple and basic calculation but
AB is
> just not doing right. I'm so frustrated that i've been thinking
about
> doing this in php! if there was a php class for technical
indicators i
> would've done just that!
>
> I appreciate your help and patience as well as other forum members.
>
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Mike" <sfclimbers@> wrote:
> >
> >
> > Yes, Cum is only looking at the 1 values in the array. But, it is
> > counting from the start of all data (i.e. from barindex 0),
whereas
> the
> > rows returned by your exploration will be limited to the selected
date
> > range.
> >
> > As for LastValue, yes, it returns a single value. But, AddColumn
is
> > expecting an array. So, the single value is effectively being
treated
> as
> > an array for which all elements are set to that value.
> >
> > Following are 3 options to do what you are asking for; Note that
the
> > output column for Sum is all zeros until the last date since
there is
> > insufficient data to calculate the result until the last bar in
the
> > range. The single value in the Cum and the manual looping cases
are
> > simply being treated as arrays despite being scalers.
> >
> > In this case, the looping option is the best performing (run each
> option
> > through Check and Profile from Tools menu). But, generally that
is not
> > the case and the built in AmiBroker functions are preferred over
> > looping.
> >
> > Finally, note that the operator is '&&' not '&'. You might find it
> > preferable to use the operator 'AND' for better clarity.
> >
> > Mike
> >
> > // Using Cum()
> > m = IIf( Open > 48 && Open < 52, 1, 0 );
> > inRange = Status( "barinrange" );
> > number = Cum( m && inRange );
> > cumResult = LastValue( number );
> >
> > // Using Sum()
> > bi = BarIndex();
> > startIndex = ValueWhen( Status( "firstbarinrange" ), bi );
> > endIndex = ValueWhen( Status( "lastbarinrange" ), bi );
> > range = ( endIndex - startIndex + 1 );
> > sumResult = Sum( m, range );
> >
> > // Using a manual loop over range
> > loopResult = 0;
> >
> > for ( i = 0; i < BarCount; i++ )
> > {
> > if ( inRange[i] && Open[i] > 48 && Open[i] < 52 )
> > {
> > loopResult++;
> > }
> > }
> >
> > // Output (select range of dates from AA window)
> > Filter = m == 1;
> >
> > AddColumn( Open, "Open" );
> > AddColumn( cumResult, "Cum" );
> > AddColumn( sumResult, "BarIndex" );
> > AddColumn( loopResult, "Looping" );
> >
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "bigitop" doctormuniz@ wrote:
> > >
> > > you mean the price range? if so, yes, this is definitely less
than
> all
> > > quotes. but i thought Cum(m) would look only at the 1 values in
the
> > "m"
> > > array.
> > >
> > > so how can i make them equal?
> > >
> > > i just need to count the number of 1's and 0's in the array "m"
> which
> > is
> > > simply the stocks between 48 and 52 dollars for the time frame
> > specified
> > > in the Analysis window. how can i do this with AB?
> > >
> > > m = IIf(Open > 48 & Open < 52, 1, 0);
> > >
> > > number = Cum(m);
> > > result = LastValue(number);
> > >
> > > Filter = m == 1;
> > >
> > > AddColumn(Open, "Open");
> > > AddColumn(result,"result");
> > >
> > > --- In amibroker@xxxxxxxxxxxxxxx, "wavemechanic" timesarrow@
wrote:
> > > >
> > > > You probably have specified a range that is less than all
quotes
> so
> > > cum() and open are looking at different amounts of data.
> > > >
> > > > Bill
> > > > ----- Original Message -----
> > > > From: bigitop
> > > > To: amibroker@xxxxxxxxxxxxxxx
> > > > Sent: February 25, 2009 2:15 PM
> > > > Subject: [amibroker] still struggling with Sum() and Cum()
> > > >
> > > >
> > > >
> > > > ok, here's my big problem. consider this example:
> > > >
> > > > m = IIf(Open > 48 & Open < 52, 1, 0);
> > > >
> > > > number = Cum(m);
> > > > result = LastValue(number);
> > > >
> > > > Filter = m == 1;
> > > >
> > > > AddColumn(Open, "Open");
> > > > AddColumn(result,"result");
> > > >
> > > > running this code in the Analysis window returns:
> > > >
> > > > total rows: 356 rows
> > > > highest number in "result": 450
> > > >
> > > > so, first of all, shouldn't they be the exact same number and
> > > > secondly, shouldn't "result" be filled with just one value as
> > > opposed to many values?
> > > >
> > > > neither of this is happening. what am i doing wrong?!
> > > >
> > >
> >
>
------------------------------------
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