Look forward to it TJ. Just wondered whether you've considered developing something for wavelets instead of the "old" FFTs?
PS --- In [email protected], "Tomasz Janeczko" <[EMAIL PROTECTED]> wrote: > > For that you need Fourier transform and FFT is coming as a built in function in 4.86 > > Best regards, > Tomasz Janeczko > amibroker.com > ----- Original Message ----- > From: "Fred" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Friday, October 06, 2006 3:48 AM > Subject: [amibroker] Re: Polynomial Trendlines > > > > Now if someone can take this method and/or AFL or at least provide a > > how to that takes us into Trigometric curve fitting and extrapolation > > i.e. the solution of simultaneous equations in the generalized format > > of a spectral model i.e. ... > > > > S ~ (a1 cos w1t + b1 sin w1t) + ... + (Am cos wm + bm sin wmt) > > > > Then we might have something fairly useful ... > > > > I suspect Gaussian Elimiation can be used for this as well, but I > > don't have the skill level to calculate the necessary matrix entries > > to get it down ... > > > > Any mathematicians out there ? > > > > > > --- In [email protected], "Fred" <ftonetti@> wrote: > >> > >> When stretch over enough data almost any order will become a pseudo > >> straight line ... > >> > >> By their nature a first order IS a straight line, 2nd U shape, 3rd > >> order sine wave etc ... > >> > >> Try highlighting a SMALLER segment of data by using the beginning > > and > >> ending range markers ... > >> > >> > >> --- In [email protected], "d_hanegan" <dhanegan@> wrote: > >> > > >> > Fred: > >> > > >> > Thanks for your posts and all of the information concerning the > >> > Polynomial Trendlines. When I run the code, I pretty much just > > get > >> > a straight green line; it does not fit my data. I thought I had > >> > read all of the posts. Am I missing something? > >> > > >> > Thanks. > >> > > >> > Dan > >> > --- In [email protected], "Fred" <ftonetti@> wrote: > >> > > > >> > > Be AWARE ... that was a hand picked image ... if you play with > >> > > PolyFit you will see that sometimes data fits the > > extrapolations, > >> > > sometimes it doesn't. > >> > > > >> > > The higher the order, the flakier the extrapolations are likely > >> to > >> > > become ... > >> > > > >> > > So ... Remember what it is ... a generator of an equation in > > the > >> > form > >> > > > >> > > Y = a + bx + cx^2 + ... + nx^(n-1) > >> > > > >> > > Where the coeeficients were pick to fit the data. > >> > > > >> > > IMHO what PolyFit is, epecially with very high orders is a very > >> > good > >> > > detrender of IN SAMPLE data, nothing more, nothing less ... > > That > >> > in > >> > > and of itself is a useful tool ... Gaussian Elimination can > > also > >> > be > >> > > the basis for some other things that are pretty decent when the > >> > order > >> > > is kept fairly low i.e. 3 or 4 ... > >> > > > >> > > --- In [email protected], "Ara Kaloustian" <ara1@> > > wrote: > >> > > > > >> > > > Polynomial TrendlinesFred, > >> > > > > >> > > > There have been a lot of posting on this subject. Your one > >> > image > >> > > however is a very powerful message of its potential. > >> > > > > >> > > > Now I have to go back and review all the post ... hoping to > >> find > >> > a > >> > > good reference to study. > >> > > > > >> > > > Anyone using it succesfully now? > >> > > > > >> > > > Ara > >> > > > ----- Original Message ----- > >> > > > From: Fred Tonetti > >> > > > To: [email protected] > >> > > > Sent: Tuesday, October 03, 2006 3:32 PM > >> > > > Subject: [amibroker] RE: Polynomial Trendlines > >> > > > > >> > > > > >> > > > Oops . > >> > > > > >> > > > > >> > > > > >> > > > Meant to include this visual . > >> > > > > >> > > > > >> > > > > >> > > > Green is calculated . White is extrapolated . > >> > > > > >> > > > > >> > > > > >> > > > > >> > > > > >> > > > > >> > > > > >> > > > ---------------------------------------------------------- ---- > > -- > >> - > >> > --- > >> > > ---------- > >> > > > I am using the free version of SPAMfighter for private > > users. > >> > > > It has removed 8588 spam emails to date. > >> > > > Paying users do not have this message in their emails. > >> > > > Try SPAMfighter for free now! > >> > > > > >> > > > >> > > >> > > > > > > > > > > > > > > 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 other support material please check also: > > http://www.amibroker.com/support.html > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > Please note that this group is for discussion between users only. 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