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<SPAN
class=079431920-03122003>Philip,
<SPAN
class=079431920-03122003>
Try the
following:
<SPAN
class=079431920-03122003> <SPAN
class=079431920-03122003>
<FONT
face="Times New Roman"><SPAN
class=079431920-03122003> Trend:= Mov(C, 55, E) >
Ref(Mov(C, 55, E), -1);<?xml:namespace prefix = o ns =
"urn:schemas-microsoft-com:office:office" />
<FONT
face="Times New Roman"><SPAN
class=079431920-03122003> Trigger:= Mov(C, 8, E) >
Mov(C, 13, E);
<FONT face="Times New Roman"
size=3>
<FONT
face="Times New Roman"><SPAN
class=079431920-03122003> Test:= If(PREV =
0,
<FONT
face="Times New Roman"><SPAN
class=079431920-03122003> If(Trend, 1,
0),
<FONT
face="Times New Roman"><SPAN
class=079431920-03122003> If(Trigger, 2,
<FONT
face="Times New Roman"><SPAN
class=079431920-03122003> If(Trend + Trigger = 0, 0,
PREV)));
<FONT face="Times New Roman"
size=3>
<FONT
face="Times New Roman"><SPAN
class=079431920-03122003> Signal:= Cross(Test,
1.5);
<FONT face="Times New Roman"
size=3>
<SPAN
><SPAN
class=079431920-03122003> Signal
<SPAN
>
<SPAN
>
The signal plot
should spike up for one bar every time you get your first cross-over after the
trend has been established; it will not reset until both the 55 EMA has turned
down and the 8 EMA has crossed below the 13 EMA again; you can also create the
separate indicators called Trend, Trigger, Test and Spike and drop them into
separate windows below your price plot and observe the interaction between
them.
<SPAN
class=079431920-03122003>
If you are also a
member of the EquisMetaStock Yahoo group you should check out the files section
and download "Using latches in MS.doc" posted there by Roy Larsen; this
will give you a very detailed explanation of the structure and operation of
latched indicators like the one above.
<SPAN
class=079431920-03122003>
Good
trading.
<SPAN
class=079431920-03122003>
<SPAN
class=079431920-03122003>Mike
<FONT
face=Tahoma size=2>-----Original Message-----From: Philip
[mailto:pschmi02@xxxxxxxxxxx] Sent: Thursday, 4 December 2003 6:21
AMTo: Metastockusers@xxxxxxxxxxxxxxxSubject: RE:
[Metastockusers] Writing code for "the first time an event
happens"Thank you, the list of important functions is
very helpful. I'll go over it carefully. Meanwhile, I could be mistaken,
but I don't think that the ALERT function is the one I need.My
understanding is that ALERT would tell me that EventA took place during
the lookback period. Example:ALERT(EventA, 5) --> sometime
during/within the last 5 periods EventA did in fact take
place.This stuff can be tricky. It's never as clear to the other guy
as it is to oneself. So let me try to clarify. I'm trying to write
this:Sometime in the past condition1 began (say, the EMA(55) started
to decline).Condition1 continues to be true on the current bar.
EMA(55) is still declining today.During the period where
condition1 has been true -- in others words from the first bar where the
EMA(55) started to decline -- to the bar immediately preceeding the
present bar, EventA did not take place. Today, however, while condition1
continues to be true, while the EMA(55) continues to decline, EventA HAS
finally taken place. So this is the first time, the first bar, since the
bar on which the EMA(55) began to decline that EventA has occurred. Ever
since EMA(55) has been declining (from the first bar on) EventA
(say, cross(EMA(8), EMA(13)) has not taken place -- UNTIL TODAY, that is,
until the present bar. And today (cross(EMA(8), EMA(13).Since
everybody loves a bull market, let me use a further example. For stock XYZ
the EMA(55) began to rise in the first week of June, 2003. It's still
rising on December 3, 2003 (that's some run, huh?). But I'm not interested
any more in identifying occurrences of EventA at this stage of XYZ's
stellar performance. I see now, with 20-20 hindsight, that the time to
identify EventA would have been the very first time it occurred after the
EMA(55) had begun to rise. Perhaps that was sometime in early July, or
sometime in August. It doesn't matter. Just so long as it's the first time
EventA occurred since XYZ starting moving up according to whatever trend
definition I'm using, in this case that's a rising EMA(55).So
tonight, based on my experience with XYZ, I'm going to sit down and
explore for stocks/futures where EventA has taken place today for the
first time since my trend definition began to be true -- which could have
been the day after Labor Day, or Halloween or Thanskgiving.There,
have I succeeded in confusing matters beyond repair? :-)Again,
your list of functions brings me a step further. I'd never boiled it down
that way, and there a couple of functions I definitely need to look
into.Thanks,PhilipTo
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