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Dave,
Now I see, you donīt need to be 10 below a conditional [ie
significant] peak, you just want to be 10 below the nearest local
[unconditional] peak.
For conditional peaks/troughs you may see #17601.
Dimitris Tsokakis
--- In amibroker@xxxxxxxxxxxxxxx, "Dave Merrill" <dmerrill@xxxx>
wrote:
> thanks for looking; replies below.
>
> > a. You consider absolute threshold values. It is almost useless,
you
> > should take percentage.
> > A threshold = 10 would give hundreds of signals for NDX values and
> > rare signals for CSCO or no signal for a stock below 10$. NDX
would
> > need a threshold=100, which would never give any signal for MSFT.
>
> I think you're assuming that the input to this function is a stock
price. I
> was thinking it would be an indicator, something like MAM, RSI,
RSIStoch,
> CCI, MTI etc.. you're still correct that with some indicators, a
percentage
> change would make more sense, but some are more like linear. for
instance,
> you'd want to look for 10 unit changes in CCI, not a 10% change.
>
>
> > b. In your
> >
> > tracking = 0; // last peak we're comparing to
> > action = 0; // last action taken; +1 = up, -1 = down
> > > result[0] = 0;
> > > for(i = 1; i < BarCount; i++)
> > > {
> > > result[i] = 0; // default output for this bar if no
> > move
> > > if(action != 1) // looking for a rise
> >
> > you begin, in the second line, define action=0.
> > Then, without any other "action" reference, you ask
> > if(action != 1)
> > But, of course "action" is still =0 from the 2nd line and is not
> > equal to 1.
>
> notice the 'for' loop, which iterates for every bar. action gets set
> initially at the top of the function, outside the loop, meaning
that no
> action has taken place yet. then the loop goes through each bar,
possibly
> setting an action value if a threshold has been hit. the test
you're talking
> about is inside the loop, reacting to the last action set: if we
last did an
> up move, we're looking for a down move next; if we last went down,
we're
> looking for an up.
>
> make sense? try running it with MAM as an input, for instance.
>
>
> > From your description :"...single bar that's at least the
threshold
> > amount greater than the minimum value seen...", if we agree to
> > change the "amount" with "percentage", I have a solution, posted
long
> > time ago, the "realistic peak condition" and, instead of
searching, I
> > may repost it.
> > I can detect the point which is 3% lower than the last "visible"
> > peak. If it is what you search, please let me know and I will
revert.
> > Dimitris Tsokakis
>
> I'd say that both percentage and simple level conditions would be
valuable,
> so yes, please, point me at your realistic peak function.
>
> I'm still surprised that it seems difficult to build these kinds of
things
> in AFL. I think my code does work, but I expected a simpler, array
function
> version to have appeared by now.
>
> btw, that's not a criticism of you or anyone else here. every
language has
> things you can express really easily and quickly and ones you
can't. I guess
> this is one of those not-so-easy combinations.
>
> thanks again, keep in touch,
>
> dave
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