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[amibroker] Re: Brain fried, How do I plot a zero line on my MACD
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Dennis, Brian, all -
I'd suggest that we let Tomasz worry about the "how". What I think Tomasz does a masterful job of is "integrating" requests and requirements within his desired business model. And finally consider this - even the best programmer can make educated guesses about another's code, but only the author knows what is truly possible and most efficient.
With that in mind, I will mention two things though that are possible "opportunities", and I'll mention them here only to stimulate thought on others that might have been overlooked or might be desirable. My personal inclination is to code around issues and get on with using the app and/or trading. But -
- Long history of high frequency bars such as 1-min bars create some special problems. When editing/developing an AFL that is inserted on a chart, any change causes an execution using all bars. This can be painful very painful when you have 100k+ bars and complex code. I understand why AB needs to do this, but there is a "chicken and egg" problem of needing to execute the AFL on all bars in order to get the SetBarsRequired() requirements. Something should be done about this long term because it makes debugging / development painful. I just code around it by detecting the all bar condition and bypassing calculations except for a SetBarsRequired(). I can then click to test with the smaller number of bars.
- In the AA, Tomasz implemented almost all that is needed. The only thing that is a slight drawback is that if you run an Explore or Scan on a CURRENT SYMBOL on an unchanged AFL, it doesn't use the SetBarsReuiqed() from the previous execution. It does use the requirement, though, on tickers 2-N when it is run on a watchlist. SO, I consider this a minor annoyance, and am guessing that TJ had to do this for structural reasons.
-- BruceR
--- In amibroker@xxxxxxxxxxxxxxx, Dennis Brown <see3d@xxx> wrote:
>
> Brian,
>
> I believe that Tomasz is quite good at how he allocates and
> deallocates memory internally for arrays. Also if you are only
> talking about a few thousand bars, more time could be lost in trying
> to shuffle things around than just using all the bars. My minimum
> number of bars for a calculation is 7,000. That is just to get
> accurate real time trading signals. For backtesting, I use 200,000
> bars. When you are talking high bar counts, then being able to have
> control over the calculation size of the arrays can amount to some
> serious time savings.
>
> However, you are right in that if a large number of bars is only
> needed for an occasional calculation to generate some reference data,
> then it can be costly in time and space to make everything have to use
> all the bars. That is something that would take a programmer to
> recognize and be able to optimize.
>
> I look for cases where I can take advantage of these cases. So far,
> the only way to do this was to save the data to something like an ATC
> ticker and use foreign to access the data, or to run two different
> charts at different refresh rates and have them communicate their data
> via static variables.
>
> Trying to have AB figure out all this on the fly is complicated and
> beyond my understanding of how it could be done.
>
> BR,
> Dennis
>
>
> On Jun 30, 2009, at 9:38 AM, brian_z111 wrote:
>
> >> if RAM needs reorganizing, save the last 100 bars from the
> >> variables >etc calculated on 1000 bars e.g. static arrays etc, dump
> >> the rest >and then reload the new global SBR # bars i.e. 100.
> >
> >
> > What I meant to ask there was if it is possible to dump some data
> > out of RAM and keep a smaller amount that you will need
> > thereafter ... maybe move it around in RAM to to where it is needed
> > without the need to start again by dumping the lot and reading 100
> > bars in from the disc again.
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "brian_z111" brian_z111@ wrote:
> >>
> >> Well, if my assumptions so far are more or less correct then that
> >> leads me towards another possibility ........
> >>
> >>
> >> ...... depending on how RAM memory works (not sure about that)
> >>
> >> - assuming a database of 5000 bars
> >>
> >> - if we need a large number of bars, say 1000, to calculate a long
> >> term indicator, or indicators ... if this was the largest bar
> >> requirement it could become the coded global SBR setting (I assume
> >> that this setting might make the need to load all bars for the
> >> first pass obsolete ... possibly polling all bars on the first pass
> >> has a function (check if bars are not null value, maybe?) ...
> >> assuming this function can be passed to the global SBR bars then
> >> putting the global SBR at the head of the code could drive AB to
> >> load only 1000 bars.
> >>
> >> - assuming that the 1000 bars are only need for a one off calc ...
> >> if we leave them all there will they restrict RAM availability for
> >> other uses (as I said I am not sure if contiguous memory on the
> >> disc translates into contiguous memory in RAM) ... if there is any
> >> RAM advantage to be gained then a second global SBR command, set
> >> to, say 100 bars, that comes after the block of code that needed
> >> 1000 bars, could trigger off a dump of the 900 bars no longer need
> >> OR of RAM needs reorganizing, save the last 100 bars from the
> >> variables etc calculated on 1000 bars e.g. static arrays etc, dump
> >> the rest and then reload the new global SBR # bars i.e. 100.
> >>
> >> Blocks of code that only need < 100 bars could then be controlled
> >> via local SBR settings (one for each block).
> >>
> >>
> >> Beyond that idea #3 keeps coming back to me.......
> >>
> >> i.e. that AB could, should, would poll the CPU for availability and
> >> prioritize processing tasks.
> >>
> >> Some kind of flow control for the order of execution could be a
> >> tiny step in that direction i.e. reprocessing of a block of code,
> >> with a large number of bars, might be set to low priority (if you
> >> only need the answer every now and then) and AB would feed it to
> >> the processor a bit at a time (when the processor is not busy on
> >> your hot short term code).
> >>
> >>
> >>
> >>
> >> --- In amibroker@xxxxxxxxxxxxxxx, Dennis Brown <see3d@> wrote:
> >>>
> >>> Brian,
> >>>
> >>> Yes there are two pieces. The number of bars loaded, and the number
> >>> of bars used in an array calculation. Both are important for speed,
> >>> but the number used for array calculations can make the most
> >>> difference if it can be reduced. It would take a comprehensive
> >>> discussion of all the different possibilities and what could be
> >>> gained
> >>> be each one to clarify all the issues. Bruce hinted that that has
> >>> already taken place in the past with TJ. My simplest case is just
> >>> to
> >>> allow the SBR in future passes to reduce the number of bars like
> >>> possible on the first pass.
> >>>
> >>> BR,
> >>> Dennis
> >>>
> >>>
> >>> On Jun 30, 2009, at 5:44 AM, brian_z111 wrote:
> >>>
> >>>> Clarification:
> >>>>
> >>>> The longest SBR, of the complete formula, could be the primary
> >>>> (global)SBR, and control the # bars loaded into memory,
> >>>> while the secondary SBR's set how many of the bars already loaded
> >>>> into memory to actually use, for any particular block of code (as
> >>>> defined by the local SBR's???????????????????????????????????????
> >>>>
> >>>>
> >>>>
> >>>> --- In amibroker@xxxxxxxxxxxxxxx, "brian_z111" <brian_z111@> wrote:
> >>>>>
> >>>>> I still have a few questions about this.
> >>>>>
> >>>>> FTR:
> >>>>>
> >>>>> I am OK with the idea so far ... I am wondering about the
> >>>>> practicality of the implementation though... I guess you guys
> >>>>> (Fred,Bruce,Dennis), being programmers, are confident you are
> >>>>> going
> >>>>> to gain time, either when running long BT's or Opts OR only in RT
> >>>>> charts?
> >>>>>
> >>>>> Does anyone have any idea where these gains would come from, or
> >>>>> how
> >>>>> they could be achieved, in processing terms .... what sort of time
> >>>>> gains can we expect if Tomasz does decide to action the idea?
> >>>>>
> >>>>> When Dennis said that calling SBR with a lower # bars RESTARTS the
> >>>>> charts I am guessing that he means bars are reloaded into memory,
> >>>>> thus rebuilding the charts.... is this the default behaviour?
> >>>>>
> >>>>> .. if so this would be the default for any change of setting
> >>>>> (either up or down) so any change of setting has this 'penalty'
> >>>>> attached?
> >>>>>
> >>>>> Are you guys suggesting that, where two or more calls are made to
> >>>>> SBR() that AB could still estimate max bars required for the
> >>>>> longest SBR after the first pass, keep them in memory, but only
> >>>>> access the number required for each subsequent block of shorter
> >>>>> length arrays .... i.e. where there are more than one SBR in a
> >>>>> formula, the longest SBR will be the primary SBR, and control
> >>>>> the #
> >>>>> bars loaded, while the secondary SBR's set how many of the loaded
> >>>>> bars to actually use?
> >>>>>
> >>>>> I don't know if instructing AB to change to using, say, 10 bars,
> >>>>> from a loaded memory of, say, 100, has much of a time penalty
> >>>>> attached to it ... I guess not?
> >>>>>
> >>>>> I don't understand how processors work so I am not certain that
> >>>>> this would lead to a time gains ... I guess if there are gains to
> >>>>> be had, by this method, it would depend on how long it takes to
> >>>>> change the no bars actually processed and ... how many lines of
> >>>>> code are included in the short array block.
> >>>>>
> >>>>> I assume that processing 10 bars, already in memory, is actually
> >>>>> faster than processing the whole 100, already in memory .... that
> >>>>> is a big assumption on my part (could be wrong!).
> >>>>>
> >>>>> Is that what you guys are suggesting or is it something else?
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> --- In amibroker@xxxxxxxxxxxxxxx, Dennis Brown <see3d@> wrote:
> >>>>>>
> >>>>>> Bruce,
> >>>>>>
> >>>>>> Thanks for your suggestions. They are appreciated. I will
> >>>>>> contact
> >>>>>> you off-line for further discussion about these.
> >>>>>>
> >>>>>> I am glad to see that I am not the only one who would like to
> >>>>>> have
> >>>>>> more control over the number of bars used in AFL. I posted one
> >>>>>> bug
> >>>>>> related to these long ago, and commented on the one way nature of
> >>>>>> SBR,
> >>>>>> but never posted my own suggestion for having the ability to
> >>>>>> reduce
> >>>>>> the number of bars via SBR, because I previously could not get
> >>>>>> any
> >>>>>> responses from this forum or support about how I should go about
> >>>>>> trying to do this. I did not want to suggest something without
> >>>>>> knowing it was desired by more than myself, or understanding if
> >>>>>> there
> >>>>>> was another way to do it. I have now posted a suggestion #1790,
> >>>>>> so we
> >>>>>> have a place holder for the desired functionality. http://www.amibroker.com/feedback/view_bug.php?bug_id=1790
> >>>>>>
> >>>>>> Best regards,
> >>>>>> Dennis
> >>>>>>
> >>>>>> On Jun 29, 2009, at 9:19 AM, bruce1r wrote:
> >>>>>>
> >>>>>>> Dennis -
> >>>>>>>
> >>>>>>> I was just making sure about you understanding of the
> >>>>>>> SetBarsRequired() placement. I agree with most of your summary,
> >>>>>>> but
> >>>>>>> let's put the minor points aside and turn to your issue.
> >>>>>>> FWIW, I'd
> >>>>>>> like to have full control over bar requirements also.
> >>>>>>> Actually -
> >>>>>>> even more than you want, but that's another story. Its
> >>>>>>> something
> >>>>>>> that I and Fred and I have both discussed with Tomasz some time
> >>>>>>> ago. I might even muse on TJ's reasoning in his current design,
> >>>>>>> but
> >>>>>>> he really should comment. But, we have to deal with the hand
> >>>>>>> that
> >>>>>>> we're dealt.
> >>>>>>>
> >>>>>>> My impression is that you have an "all in one" indicator that
> >>>>>>> you
> >>>>>>> try to use as a control and analysis center. I'll confess that
> >>>>>>> I've written one of these also, but moved away from that type of
> >>>>>>> design for various reasons. I think that we are at a point
> >>>>>>> that if
> >>>>>>> you want to explore some workarounds, we'll have to examine your
> >>>>>>> requirements in detail, and this is probably best moved o
> >>>>>>> ffline to
> >>>>>>> e-mail.
> >>>>>>>
> >>>>>>> Before I do that, I'll offer some comments that I hope might
> >>>>>>> be of
> >>>>>>> general interest about this general problem. Let's recap your
> >>>>>>> statement about the design issue -
> >>>>>>>
> >>>>>>> You said - "In my case, I sometimes want to take a one shot
> >>>>>>> pass at
> >>>>>>> allthe bars to gather some statistics and save them, then
> >>>>>>> immediately dropback to some minimum number of bars to speed
> >>>>>>> up the
> >>>>>>> user interface for changing parameters in the parameter window
> >>>>>>> or
> >>>>>>> even working with on-chart buttons, and go back to real time
> >>>>>>> trading."
> >>>>>>>
> >>>>>>> So, given that as the problem statement, some alternatives are -
> >>>>>>> Note that having say SetBarsRequired(100,0), for example,
> >>>>>>> DOES NOT
> >>>>>>> preclude passing all of the data. I suspect that what you want
> >>>>>>> is
> >>>>>>> to
> >>>>>>> expand the back bars then call Equity() and gather stats. A
> >>>>>>> viable
> >>>>>>> alternative in some cases is just to programatically zoom to the
> >>>>>>> full range, run and store the stats,and programatically zoom
> >>>>>>> back
> >>>>>>> to
> >>>>>>> the original range. This preserves the 100 bars back setting.
> >>>>>>> Another slightly more flexible alternative is to run the
> >>>>>>> backtestin
> >>>>>>> the AA. To do this, you shell out to a JScript "controller"
> >>>>>>> program
> >>>>>>> which invokes the appropriate AA backtest and stores the
> >>>>>>> results.
> >>>>>>> In your case, though, this might require the passing of many
> >>>>>>> parameters in static variables, though. However, I use this
> >>>>>>> technique for running a portfolio backtest over a dynamic
> >>>>>>> watchlist
> >>>>>>> on demand from an indicator. BTW, it seems to "free up" the
> >>>>>>> indicator display, but I have only run this on EOD data and
> >>>>>>> can't
> >>>>>>> comment on how much parallelism can be achieved on RT data.
> >>>>>>> And, I
> >>>>>>> assume that TJ has the appropriate lock-outs, but after about a
> >>>>>>> year
> >>>>>>> and a half of use, no problems.
> >>>>>>> The backtest "indicator" can be run in another document. This
> >>>>>>> document can have a different, full data range. This has the
> >>>>>>> advantage of only calculating when when visible, but I'd still
> >>>>>>> put a
> >>>>>>> trigger on it. But, again, some parameter communication would
> >>>>>>> be
> >>>>>>> needed.
> >>>>>>> Each individual would have to decide on the trade-off's. #1 is
> >>>>>>> the
> >>>>>>> easiest. #2 might allow for some interesting things if and
> >>>>>>> when TJ
> >>>>>>> implements multi-processor support. There are even a few other
> >>>>>>> alternatives. But this is probably enough food for thought.
> >>>>>>>
> >>>>>>> -- BruceR
> >>>>>>>
> >>>>>>> --- In amibroker@xxxxxxxxxxxxxxx, Dennis Brown <see3d@> wrote:
> >>>>>>>>
> >>>>>>>> Bruce,
> >>>>>>>>
> >>>>>>>> Yes, I understand the SBR requirements. My AFLs have it as the
> >>>>>>>> last
> >>>>>>>> statement. The thing I was showing below was some wishful
> >>>>>>>> thinking
> >>>>>>> if
> >>>>>>>> the way SBR worked were modified to allow for reducing the
> >>>>>>>> number of
> >>>>>>>> bars at each call. In fact it would be good to iterate how it
> >>>>>>>> works
> >>>>>>>> here so nobody gets confused by my musings:
> >>>>>>>>
> >>>>>>>> When the indicator chart is first run, it takes a pass just to
> >>>>>>> figure
> >>>>>>>> out how man y bars are required (it also compiles other
> >>>>>>> information to
> >>>>>>>> speed executions). Each function, or loop may have a different
> >>>>>>>> requirement for historical bars previous to the
> >>>>>>>> FirstVisibleBar.
> >>>>>>> This
> >>>>>>>> first AFL pass might give erroneous results since it does not
> >>>>>>>> know
> >>>>>>>> until the end of the pass what all the requirements are, but I
> >>>>>>>> think
> >>>>>>>> it uses all bars, so that should not cause a problem. It is a
> >>>>>>>> peak
> >>>>>>>> detecting function, so that it only increased the number of
> >>>>>>>> bars
> >>>>>>>> required, and never decreases them. If I have operations that
> >>>>>>>> write
> >>>>>>>> information to files or static variables, I disable the writes
> >>>>>>> during
> >>>>>>>> this pass since the ChartID is not valid yet.
> >>>>>>>>
> >>>>>>>> Subsequent AFL passes now know how many bars to load from the
> >>>>>>> database
> >>>>>>>> to make sure that the visible bars show accurate results.
> >>>>>>>>
> >>>>>>>> If some new conditional AFL code executes during one of the
> >>>>>>> subsequent
> >>>>>>> &g t; AFL passes, for instance an AddToComposite() function that
> >>>>>>> requires
> >>>>>>>> all bars, or an SetBarsRequired() function with a larger
> >>>>>>>> number of
> >>>>>>>> bars, the next pass of AFL will load more bars and this will be
> >>>>>>>> the
> >>>>>>>> new minimum bars requirement. However, I have noticed in my
> >>>>>>>> charts,
> >>>>>>>> that the first pass after a new requirement may not use the
> >>>>>>>> higher
> >>>>>>>> number of bars for an extra pass, so I am not sure about the
> >>>>>>>> exact
> >>>>>>>> sequence. Perhaps, a new requirement caused another "bar
> >>>>>>>> requirements" gathering pass first. This can lead to errors
> >>>>>>>> if you
> >>>>>>>> are saving results on a one shot basis in a static variable or
> >>>>>>>> file.
> >>>>>>>>
> >>>>>>>> If an SetBarsRequired() statement is found at the very end of
> >>>>>>>> the
> >>>>>>> AFL,
> >>>>>>>> then it will override the previous requirements. However, it
> >>>>>>>> still
> >>>>>>>> will not allow you to reduce the requirements after the first
> >>>>>>>> pass.
> >>>>>>>>
> >>>>>>>> I am not aware of any detailed descriptions or flow charts of
> >>>>>>>> this
> >>>>>>>> execution process for AFL, so all of this is just from
> >>>>>>>> observations
> >>>>>>>> while debugging code, and might be incorrect.
> >>>>>>>>
> >>>>>>>> I was musing about giving the user AFL control over the
> >>>>>>>> reducing
> >>>>>>>> the
> >>>>>>>> number of bars used on subsequent passes.
> >>>>>>>>
> >>>>>>>> In my case, I sometimes want to take a one shot pass at all the
> >>>>>>>> bars
> >>>>>>>> to gather some statistics and save them, then immediately drop
> >>>>>>> back to
> >>>>>>>> some minimum number of bars to speed up the user interface for
> >>>>>>>> changing parameters in the parameter window or even working
> >>>>>>>> with
> >>>>>>>> on-
> >>>>>>>> chart buttons, and go back to real time trading. It is a real
> >>>>>>>> drag
> >>>>>>>> when I have to wait 5 seconds between every parameter change --
> >>>>>>> which
> >>>>>>>> is the fastest I have been able to drop back to from the 20
> >>>>>>>> second
> >>>>>>>> full pass with SBR working in its current operating mode. At 5
> >>>>>>>> seconds, a lot of the user interface functions stop worki ng.
> >>>>>>>> It
> >>>>>>> takes
> >>>>>>>> me quite a while to get my chart back to trading fast after
> >>>>>>>> using
> >>>>>>> more
> >>>>>>>> bars for a (not so) quick test.
> >>>>>>>>
> >>>>>>>> Of course, once the user takes control of the number of bars
> >>>>>>> required,
> >>>>>>>> it is his responsibility to monitor the requirements carefully.
> >>>>>>>>
> >>>>>>>> BR,
> >>>>>>>> Dennis
> >>>>>>>>
> >>>>>>>>
> >>>>>>>> On Jun 28, 2009, at 9:17 PM, bruce1r wrote:
> >>>>>>>>
> >>>>>>>>> Dennis -
> >>>>>>>>>
> >>>>>>>>> Close, but not quite. If you were going to use
> >>>>>>>>> SetBarsRequired()
> >>>>>>> to
> >>>>>>>>> control the lookback, it is CRITICAL that it be the LAST
> >>>>>>> statement in
> >>>>>>>>> the program. If it is not, subsequent statements ( such as
> >>>>>>>>> HHV() )
> >>>>>>>>> may
> >>>>>>>>> add to the requirement. If you want to see a detailed
> >>>>>>> explanation of
> >>>>>>>>> this, refer to Tomasz's QuickAFL article in the KB.
> >>>>>>>>>
> >>>>>>>>> Regarding the issues that you described in your previous
> >>>>>>> response to
> >>>>>>>>> me,
> >>>>>>>>> there are a couple of ways to deal with the issue that you are
> >>>>>>>>> describing. When the teenagers go to bed and its quiet later,
> >>>>>>>>> I'll
> >>>>>>>>> try
> >>>>>>>>> to outline one.
> >>>>>>>>>
> >>>>>>>>> -- BruceR
> >>>>>>>>>
> >>>>>>>>> --- In amibroker@xxxxxxxxxxxxxxx, Dennis Brown see3d@ wrote:
> >>>>>>>>>>
> >>>>>>>>>> Yes Tony,
> >>>>>>>>>>
> >>>>>>>>>> This is close to what I was referring to as the array
> >>>>>>>>>> solution,
> >>>>>>>>>> though
> >>>>>>>>>> I would probably write it like this to make it symmetrical:
> >>>>>>>>>>
> >>>>>>>>>> minmax = LastValue( HHV( abs( m ), r ) );
> >>>>>>>>>>
> >>>>>>>>>> It would be interesting if we could have a faster operation
> >>>>>>> such that
> >>>>>>>>>> if we used a SetBarsRequired( r, 0 ) in the preceding
> >>>>>>>>>> statement
> >>>>>>> to
> >>>>>>>>>> reduce the range so the the range equaled the number of bars
> >>>>>>>>>> specified, that the returned value would be a single number
> >>>>>>>>>> of
> >>>>>>> the
> >>>>>>>>>> result. Hmmmmm. If that mode were available, it would look
> >>>>>>>>>> like
> >>>>>>>>> this:
> >>>>>>>>>>
> >>>>>>>>>> m = MACD();
> >>>>>>>>>>
> >>>>>>>>>> fb = Status("FirstVisibleBar");
> >>>>>>>>>> lb = Status("LastVisibleBar");
> >>>>>>>>>> r = lb - fb;
> >>>>>>>>>>
> >>>>>>>>>> SetBarsRequired( r, 0 )
> >>>>>>>>>> maximum = HHV( abs( m ), r );
> >>>>>>>>>> Plot( m, "MACD", colorRed, styleOwnScale, -maximum,
> >>>>>>>>>> maximum );
> >>>>>>>>>> Plot(0, "", colorBlack, styleOwnScale, -maximum, maximum);
> >>>>>>>>>>
> >>>>>>>>>> Just a little brainstorming.
> >>>>>>>>>>
> >>>>>>>>>> BR,
> >>>>>>>>>> Dennis
> >>>>>>>>>>
> >>>>>>>>>> On Jun 28, 2009, at 8:31 AM, Tony Grimes wrote:
> >>>>>>>>>>
> >>>>>>>>>>>
> >>>>>>>>>>>
> >>>>>>>>>>> Try this solution, array style:
> >>>>>>>>>>>
> >>>>>>>>>>> m = MACD();
> >>>>>>>>>>>
> >>>>>>>>>>> fb = Status("FirstVisibl eBar");
> >>>>>>>>>>> lb = Status("LastVisibleBar");
> >>>>>>>>>>> r = lb - fb;
> >>>>>>>>>>>
> >>>>>>>>>>> minimum = LastValue( LLV( m, r ) );
> >>>>>>>>>>> maximum = LastValue( HHV( m, r ) );
> >>>>>>>>>>>
> >>>>>>>>>>> Plot( m, "MACD", colorRed, styleOwnScale, minimum,
> >>>>>>>>>>> maximum );
> >>>>>>>>>>> Plot(0, "", colorBlack, styleOwnScale, minimum, maximum);
> >>>>>>>>>>>
> >>>>>>>>>>>
> >>>>>>>>>>> On Sat, Jun 27, 2009 at 11:16 AM, Dennis Brown see3d@
> >>>>>>>>>>> wrote:
> >>>>>>>>>>>
> >>>>>>>>>>>
> >>>>>>>>>>> Maybe not...
> >>>>>>>>>>>
> >>>>>>>>>>> Through this discussion, the problem has been reduced to
> >>>>>>> aligning
> >>>>>>>>> the
> >>>>>>>>>>> min/max range of a MACD styleOwnScale plot to another zero
> >>>>>>>>>>> line
> >>>>>>>>>>> styleOwnScale plot statement. Therefore, the only way to do
> >>>>>>> this is
> >>>>>>>>>>> to find the min/max values of the MA CD function in the
> >>>>>>> visible bars
> >>>>>>>>>>> range and use those numbers in both plot statements, or make
> >>>>>>>>>>> the
> >>>>>>>>> MACD
> >>>>>>>>>>> range symmetrical and then the zero line statement can be
> >>>>>>>>>>> any
> >>>>>>>>>>> symmetrical range.
> >>>>>>>>>>>
> >>>>>>>>>>> I am happy with my dual colored plot line at this point.
> >>>>>>> However, to
> >>>>>>>>>>> complete the original idea, I could use a simple loop to
> >>>>>>>>>>> find
> >>>>>>> the
> >>>>>>>>> min/
> >>>>>>>>>>> max numbers of the MACD, but I am now wondering if there
> >>>>>>>>>>> is a
> >>>>>>>>> "faster"
> >>>>>>>>>>> execution way using array logic instead?
> >>>>>>>>>>>
> >>>>>>>>>>> It seems like a waist of time to create an array of the Min/
> >>>>>>> Max over
> >>>>>>>>>>> that range for all bars, then just use the last value. I use
> >>>>>>> loops
> >>>>>>>>>>> when I only want a single number result related to the Min/
> >>>>>>>>>>> Max
> >>>>>>> value
> >>>>>>>>>>> over the last n bars only (like the v isible bar range).
> >>>>>>>>>>> Am I
> >>>>>>> missing
> >>>>>>>>>>> an opportunity to approach this in a more efficient way?
> >>>>>>>>>>>
> >>>>>>>>>>> BR,
> >>>>>>>>>>> Dennis
> >>>>>>>>>>>
> >>>>>>>>>>>
> >>>>>>>>>>>
> >>>>>>>>>>> On Jun 27, 2009, at 9:06 AM, gmorlosky wrote:
> >>>>>>>>>>>
> >>>>>>>>>>>> maybe....
> >>>>>>>>>>>>
> >>>>>>>>>>>> IF ( MACDline == Signalline) // histogram value equals zero
> >>>>>>>>>>>> X = lastvalue(MACDline-Signalline);
> >>>>>>>>>>>> Plot (X,"", colorblack);
> >>>>>>>>>>>>
> >>>>>>>>>>>> --- In amibroker@xxxxxxxxxxxxxxx, Dennis Brown see3d@
> >>>>>>>>>>>> wrote:
> >>>>>>>>>>>>>
> >>>>>>>>>>>>> Yes, I have it set to 100%. The absolute values of the
> >>>>>>> indicator
> >>>>>>>>>>>>> will
> >>>>>>>>>>>>> vary wildly, depending on the price and volatility of the
> >>>>>>> stock.
> >>>>>>>>> I
> >>>>>>>>>>> & gt;> plot ES, so the values are quite large at times.
> >>>>>>>>>>>>>
> >>>>>>>>>>>>> BR,
> >>>>>>>>>>>>> Dennis
> >>>>>>>>>>>>>
> >>>>>>>>>>>>> On Jun 26, 2009, at 5:58 PM, monitorit wrote:
> >>>>>>>>>>>>>
> >>>>>>>>>>>>>> If that's all you needed, the color change would be best.
> >>>>>>> But, I
> >>>>>>>>>>>>>> think the solution I suggested would work... you would
> >>>>>>>>>>>>>> still
> >>>>>>>>> plot/
> >>>>>>>>>>>>>> see value very high or low just within a section
> >>>>>>>>>>>>>> defined by
> >>>>>>>>>>> pane*1/
> >>>>>>>>>>>>>> minvalue [at least it has for me]. BTW, presently what is
> >>>>>>>>>>>>>> the
> >>>>>>>>>>> upper
> >>>>>>>>>>>>>> and lower bounds of the MACD in relationship to the
> >>>>>>>>>>>>>> height
> >>>>>>>>>>>>>> of
> >>>>>>>>> the
> >>>>>>>>>>>>>> pane? Is it 100% of the pane height?
> >>>>>>>>>>>>>> Dan
> >>>>>>>>>>>>> ;>
> >>>>>>>>>>>>>> --- In amibroker@xxxxxxxxxxxxxxx, Dennis Brown <see3d@>
> >>>>>>> wrote:
> >>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>> Dan,
> >>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>> This is what I usually do for indicators when I know the
> >>>>>>> range
> >>>>>>>>> of
> >>>>>>>>>>>>>>> values. However, MACD is an unbounded indicator, so I
> >>>>>>>>>>>>>>> don't
> >>>>>>>>> know
> >>>>>>>>>>>>>>> how
> >>>>>>>>>>>>>>> large the values are. It is only the zero crossings and
> >>>>>>>>> relative
> >>>>>>>>>>>>>>> peaks that are useful info here.
> >>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>> I just thought there would be some simple shortcut to
> >>>>>>> actually
> >>>>>>>>>>>>>>> scanning the visible bars for the min/max values to
> >>>>>>>>>>>>>>> use in
> >>>>>>> the
> >>>>>>>>>>> plot
> >>>>>>>>>>>>>>> statemen ts. I think I will just switch colors of the
> >>>>>>>>>>>>>>> MACD
> >>>>>>> from
> >>>>>>>>>>> red
> >>>>>>>>>>>>>>> to
> >>>>>>>>>>>>>>> green if it is above or below zero instead of
> >>>>>>>>>>>>>>> resorting to
> >>>>>>> yet
> >>>>>>>>>>>>>>> another
> >>>>>>>>>>>>>>> loop.
> >>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>> Thanks,
> >>>>>>>>>>>>>>> Dennis
> >>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>> On Jun 26, 2009, at 4:40 PM, monitorit wrote:
> >>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>> Dennis,
> >>>>>>>>>>>>>>>> Hi. You might try this- Place a value in minvalue
> >>>>>>>>>>>>>>>> section
> >>>>>>> but
> >>>>>>>>>>>>>>>> none
> >>>>>>>>>>>>>>>> in maxvalue section [I think maybe a value like 2
> >>>>>>>>>>>>>>>> equates
> >>>>>>> to
> >>>>>>>>> 1/2
> >>>>>>>>>>>>>>>> pan e height] of your MACD and zero plot statements.
> >>>>>>>>>>>>>>>> Also,styleNoRescale in the zero plot statement. This
> >>>>>>>>>>>>>>>> worked
> >>>>>>>>> for
> >>>>>>>>>>>>>>>> me
> >>>>>>>>>>>>>>>> when I wanted to plot a histogram and a dot on the
> >>>>>>>>>>>>>>>> top of
> >>>>>>> the
> >>>>>>>>>>>>>>>> histogram. Not sure if it works with a line. If it
> >>>>>>>>>>>>>>>> doesn't,
> >>>>>>>>> you
> >>>>>>>>>>>>>>>> could try plotohlc with H=max(0,my#) and L=min(0,my#).
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>> Dan
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>> --- In amibroker@xxxxxxxxxxxxxxx, Dennis Brown <see3d@>
> >>>>>>> wrote:
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>> Hello,
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>> This must be simple, but my AFL brain is fried
> >>>>>>>>>>>>>>>>> today. I
> >>>>>>> have
> >>>>>>>>> an
> >>>>>>>>>>>>>>>>> MACD
> >>>>>>>>>>>>>>>>> plot on top of my main price chart, and I want to
> >>>>>>>>>>>>>>>>> plot a
> >>>>>>> zero
> >>>>>>>>>>>>>>>>> line
> >>>>>>>>>>>>>>>>> over it. It is plotted as StyleOwnScale of course. I
> >>>>>>>>>>>>>>>>> can't
> >>>>>>>>> use
> >>>>>>>>>>>>>>>>> StyleLeftAxis because I am using it for something
> >>>>>>>>>>>>>>>>> else. I
> >>>>>>>>>>>>>>>>> guess I
> >>>>>>>>>>>>>>>>> could do something to figure out where the visible
> >>>>>>>>>>>>>>>>> high
> >>>>>>> and
> >>>>>>>>> low
> >>>>>>>>>>>>>>>>> values
> >>>>>>>>>>>>>>>>> of the MACD are, but it seems like it should be easier
> >>>>>>> than
> >>>>>>>>>>> that.
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>> TIA,
> >>>>>>>>>>>>>>>>> Dennis
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>> ------------------------------------
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>> **** IMPORTANT PLEASE READ ****
> >>>>>>>>>>>>>>>> This group is for the discussion between users only.
> >>>>>>>>>>>>>>>> This is *NOT* technical support channel.
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>> TO GET TECHNICAL SUPPORT send an e-mail directly to
> >>>>>>>>>>>>>>>> SUPPORT {at} amibroker.com
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> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>> For NEW RELEASE ANNOUNCEMENTS and other news always
> >>>>>>>>>>>>>>>> check
> >>>>>>>>>>> DEVLOG:
> >>>>>>>>>>>>>>>> http://www.amibroker.com/devlog/
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>> Yahoo! Groups Links
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> ------------------------------------
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> **** IMPORTANT PLEASE READ ****
> >>>>>>>>>>>>>> This group is for the discussion between users only.
> >>>>>>>>> ;>>>>> This is *NOT* technical support channel.
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> TO GET TECHNICAL SUPPORT send an e-mail directly to
> >>>>>>>>>>>>>> SUPPORT {at} amibroker.com
> >>>>>>>>>>>>>>
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> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> For NEW RELEASE ANNOUNCEMENTS and other news always check
> >>>>>>>>> DEVLOG:
> >>>>>>>>>>>>>> http://www.amibroker.com/devlog/
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> Yahoo! Groups Links
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>
> >>>>>>>>>>>>
> >>>>>>>>>>> & gt;
> >>>>>>>>>>>>
> >>>>>>>>>>>>
> >>>>>>>>>>>> ------------------------------------
> >>>>>>>>>>>>
> >>>>>>>>>>>> **** IMPORTANT PLEASE READ ****
> >>>>>>>>>>>> This group is for the discussion between users only.
> >>>>>>>>>>>> This is *NOT* technical support channel.
> >>>>>>>>>>>>
> >>>>>>>>>>>> TO GET TECHNICAL SUPPORT send an e-mail directly to
> >>>>>>>>>>>> SUPPORT {at} amibroker.com
> >>>>>>>>>>>>
> >>>>>>>>>>>> TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at
> >>>>>>>>>>>> http://www.amibroker.com/feedback/
> >>>>>>>>>>>> (submissions sent via other channels won't be considered)
> >>>>>>>>>>>>
> >>>>>>>>>>>> For NEW RELEASE ANNOUNCEMENTS and other news always check
> >>>>>>> DEVLOG:
> >>>>>>>>>>>> http://www.amibroker.com/devlog/
> >>>>>>>>>>>>
> >>>>>>>>>>>> Yahoo! Groups Links
> >>>>>>> & gt; >>>>
> >>>>>>>>>>>>
> >>>>>>>>>>>>
> >>>>>>>>>>>
> >>>>>>>>>>>
> >>>>>>>>>>>
> >>>>>>>>>>>
> >>>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>> ------------------------------------
> >>>>>>>>>
> >>>>>>>>> **** IMPORTANT PLEASE READ ****
> >>>>>>>>> This group is for the discussion between users only.
> >>>>>>>>> This is *NOT* technical support channel.
> >>>>>>>>>
> >>>>>>>>> TO GET TECHNICAL SUPPORT send an e-mail directly to
> >>>>>>>>> SUPPORT {at} amibroker.com
> >>>>>>>>>
> >>>>>>>>> TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at
> >>>>>>>>> http://www.amibroker.com/feedback/
> >>>>>>>>> (submissions sent via other channels won't be considered)
> >>>>>>>>>
> >>>>>>>>> For NEW RELEASE ANNOUNCEMENTS and other news always check
> >>>>>>>>> DEVLOG:
> >>>>>>>>> http://www.amibroker.com/devlog/
> >>>>>>>>>
> >>>>>>>>> Yahoo! Groups Links
> >>>>>>>>>
> >>>>>>> & gt; >
> >>>>>>>>>
> >>>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>
> >>>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>> ------------------------------------
> >>>>
> >>>> **** IMPORTANT PLEASE READ ****
> >>>> This group is for the discussion between users only.
> >>>> This is *NOT* technical support channel.
> >>>>
> >>>> TO GET TECHNICAL SUPPORT send an e-mail directly to
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> >>>> (submissions sent via other channels won't be considered)
> >>>>
> >>>> For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> >>>> http://www.amibroker.com/devlog/
> >>>>
> >>>> Yahoo! Groups Links
> >>>>
> >>>>
> >>>>
> >>>
> >>
> >
> >
> >
> >
> > ------------------------------------
> >
> > **** IMPORTANT PLEASE READ ****
> > This group is for the discussion between users only.
> > This is *NOT* technical support channel.
> >
> > TO GET TECHNICAL SUPPORT send an e-mail directly to
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> >
> > TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at
> > http://www.amibroker.com/feedback/
> > (submissions sent via other channels won't be considered)
> >
> > For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> > http://www.amibroker.com/devlog/
> >
> > Yahoo! Groups Links
> >
> >
> >
>
__._,_.___
**** IMPORTANT PLEASE READ ****
This group is for the discussion between users only.
This is *NOT* technical support channel.
TO GET TECHNICAL SUPPORT send an e-mail directly to
SUPPORT {at} amibroker.com
TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at
http://www.amibroker.com/feedback/
(submissions sent via other channels won't be considered)
For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
http://www.amibroker.com/devlog/
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__,_._,___
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