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Hello Jan,
Recalculation is a reminiscence of the old days
when scrolling was not
"live" and saving memory for the buffers was
important.
It will be re-enginereed some time in the
future.
Best regards,Tomasz Janeczko===============AmiBroker - the
comprehensive share manager.<A
href="">http://www.amibroker.com
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>
----- Original Message -----
<DIV
>From:
jonf
To: <A title=amibroker@xxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Thursday, September 13, 2001
5:26 PM
Subject: Re: [amibroker] Re:
foreign
Tanks b,
Very interesting and twisted way to preprocess and analyze
foreign symbol !
Unfortunately your solution is not viable to me, I want to
analyze and view 1000s of stocks compare to the overall market, and each
market group index.
I hope the speed will be improved in AmiBroker 7.8
!
Even with the explanation of Tomasz, I really don't see why
it's so slow to match all dates together, it shouldn't take more time than
looping to all the data once (an operation that most indicator do) ?Also
I still don't understand why this operation is done every-time you touch the
scroll bar ?
Jon.
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
b519b@xxxxxxx
To: <A title=amibroker@xxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Thursday, September 13, 2001
10:23 AM
Subject: [amibroker] Re: foreigh
Jon,If you are doing extensive optimization
retesting on one or two stocks, here is an approach that is workingwell
for me as I am in the middle of extensive backtesting of variationson a
single ETF. It takes some time to set up, but optimization
retesting is lightening fast. The following example is a bit simplier
than I use because I build a custom indicators from 50+ stocks in Excel,
but the following will give the general idea. 1. Export allthe
data for a stock (such as IBM).2. Import it into Excel.3. Import the
"foreign" data into Excel (I'll use the DJIA for illustration
purposes).4. Double check that the dates match for the stock data and
the foreign data. One could write an Excel function to do this, but
I just eyeball it. Usually if one gets the first date to match the
rest match up with almost no further changes.5. Save the new data as
a csv file giving it a compound name such as IBMxDJIA.6. Use the
import wizard in AB to select the data one wants from each of the
components. Currently there are only 6 data slots in AB (Open, High,
Low, Close, Volume, Open Interest), so you will have to decide which IBM
data to drop to get a space for what you want from the DJIA. Since my
indicator forumulas usually ignore Volume, that is where I usually stick
the first "foreign" data set. I like to use the Volume slot because
whatever is in Volume is automatically displayed in the background of
AB's default chart. It's nice to see how the foreign indicator relates
to the price movement. 7. If I need a second "foreign" data set, I have
AB import it into the OI slot since I never use OI. If needed one could
put foreign data into the High and Low slots, but that often produces
charts that look very confused and it might affect any stop loss
elements, so I try to leave H and L unchanged. Also I make sure allmy
custom indicators are above zero since I don't know how AB would react
if a stock has negative volume for a day.8. I then make a custom
version of my indicator formula which could be named
IBMxDJIAxBuyLowSellHigh and on the first line of the formula I include a
note recording what data is in each of the 6 stock data points in the
combo stock IBMxDJIA: for example, //O = Open of IBM//C = Close of
IBM//V = Close of DJIA//OI = Open of DJIA9. Any backtesting
using this combo stock (IBMxDJIA) is lightening fast. 10.
I hope the need for the above will disappear at some point in the future
if AB includes a match feature. Hope this helps in the
meantime.b--- In amibroker@xxxx, "jonf" <jonf_ca@xxxxx>
wrote:> Thank a lot for this Tomasz,> > Using foreign
only once help a little but Is it possible to avoid calculation (not
only for foreign, but for everything) each time we use the scroll bar
!> > Jon !Your use of Yahoo!
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