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Thanks for the info ... will try the code.
Wave~Trader
--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx> wrote:
>
> Hello,
>
> I disagree with statement that "linear interpolation [...] needs to be done".
> It is *your private* need, not everyone else need.
> Interpolated prices create "artificial reality" (a.ka. fiction) and not everyone wants
> fictional prices.
>
> General rule for markets that are closed for trading is that LAST actually traded price is used
> and this rule is applied in AmiBroker.
>
>
> If you have private need for interpolation, you can write your own formula to do this
> - detect those bars with volume = 0 and interpolate between bars with non-zero volume.
>
> You like linear interpolation, the others may want polynomial, bi-cubic, Lagrange, band-limited and other kind of
> interpolations. One would like to use (H/L)/2 the other one would like to connect last close with next open.
> I could spend months on adding different interpolation methods for 1 or 2 users
> who need specifically that or another.
> But there is no one-size-fits-all, you should implement it in your own formula, if you need that particular realisation.
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: "wavetrader2005" <wave-trader@xxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Friday, August 07, 2009 8:35 PM
> Subject: [amibroker] Pad Non-trading Days Feature
>
>
> > Hello TJ,
> >
> > I've just tried out the "Pad non-trading days" feature in 5.26.5. When conducting a cycle analysis on daily data, it's important
> > to account for all non-trading days and this feature is a step in the right direction.
> >
> > However, as discussed in an earlier email, when adding the non-trading days, a linear interpolation calculation using median price
> > ( (H+L/2) ) needs to be done to populate the price fields for those added days. Your current method of using just the closing
> > price of the bar preceding the "gap" causes problems with the cycle indicators I use, as they require a linear interpolated median
> > price to calculate on for the added non-trading days (otherwise they will plot incorrectly).
> >
> > The linear interpolation is simple enough:
> > 1. Take the difference between the median price of the bar preceding the gap and the bar subsequent to the gap.
> > 2. Divide this difference by the number of days in the gap PLUS 1; so, for a two day gap, the divisor would be 3.
> > 3. Add this result to the median price of the bar preceding the gap and use this value to populate the price field for the first
> > gap; add this same result to the newly calculated price for the first gap price, and so on, until all gaps have a calculated
> > price.
> >
> > Could you change your current method over to this method so the cycle indicators will work correctly?
> >
> > Regards,
> >
> > David Preston
> > a.k.a. Wave~Trader
> >
> >
> >
> > ------------------------------------
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>
------------------------------------
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