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Strongly agree about posting to the list, Mike. You beat me to the
punch. :-)
It never ceases to amaze me how difficult it is to express exactly
what one would like to code, and I woke up this morning realizing that
I STILL have not put into precise terms what I want to explore for.
Judging from the .jpg you sent, your code and that of metarockx,
generates a signal every time the event takes place subsequent to the
trend kicking in. But the only event I want to identify is the first
one of its kind when none other of its kind has preceded it since the
trend condition kicked in.
Let me try one more time:
1. Trend condition obtains
2. Retracement condition obtains today, BUT
3. as of yesterday, the retracement condition has never obtained since
the trend condition was first true.
So if today represents the second, third or "x" time the retracement
condition has occurred since the beginning of the trend, that's not
what I'm looking for.
Let's make believe I could write the following condition:
Condition1:= ALERT(fml("retracement"), since the beginning of the
trend);
Well, what I'm looking for is: condition1=false.
Generally I can express myself reasonably well, but in this case I'm
evidently verbally challenged. What a way to start of on a new list!
For those of you who are losing patience with me, please hang on one
more round.
Philip
--- In Metastockusers@xxxxxxxxxxxxxxx, "Mike Sloane" <mfsloane@xxxx>
wrote:
> Hi Phillip,
>
> Your email may make a little more sense to the group if you
included the
> off-line communications as well:
>
> See below:
>
> -----Original Message-----
> From: Mike Sloane [mailto:mfsloane@x...]
> Sent: Friday, 5 December 2003 11:47 PM
> To: 'Philip'
> Subject: RE: [Metastockusers] Writing code for "the first time an
event
> happens"
>
>
> Hi Philip,
>
> 1.0 Yes, you could replace Trend with any variation of your
> definition of the trend.
> 2.0 Yes, you could replace Trigger with any indicator, provided
it is
> a binary signal (only possible values are 0 or 1)
> 3.0 No; in my code, Test rises to 1 when Trend is true and rises
to 2
> when "Trend is already true and Trigger becomes true" (note Trigger
is
> true for one bar only); Signal spikes when Test rises from 1 -> 2
(i.e.
> Crosses 1.5).
>
> A couple of further points:
>
> My code is an example of a latched indicator that requires the use
of
> the PREV function; for some reason I tend to write a lot of my code
this
> way. The code posted by metarockx is a perfectly valid (and
efficient)
> way of achieving the same result without using the PREV function -
an
> important factor if you have a slower computer or many indicators
that
> use the PREV function, as it requires more processing time.
>
> However there were a couple of small errors with ">" and "<" in the
> metarockx code; I have taken the liberty of correcting it and
> rearranging it a little:
>
> Trend := Mov(C,55,E) > Ref(Mov(C,55,E),-1);
>
> StartTrend := Trend AND Ref(Mov(C,55,E),-1) < Ref(Mov(C,55,E),-2);
>
> Trigger:= Cross(Mov(C,8,E),Mov(C,13,E));
>
> Signal:= Trend AND Trigger
>
> AND BarsSince(Ref(Trigger,-1)) > BarsSince(StartTrend);
>
>
>
> Signal
>
>
>
> Note that when they are both plotted on a chart (see attached SPX -
> metarockx signal is top/blue; my signal is bottom/purple), my signal
> requires Trend to be established for one day before Trigger can
give a
> signal; metarockx code will give a signal in the case where Trend
and
> Signal both become true on the same day.
>
> It all depends on what you wish to achieve.
>
> As noted in my earlier post, when I am building an indicator like
this I
> will often create separate sub-indicators (Trend, Trigger, Test
etc) and
> plot them in separate windows on the chart, observe the interaction
and
> make sure it is doing exactly what I intended.
>
>
> Good trading,
> Mike
>
> PS: you may wish to post this to the group to "complete" the thread
- I
> will leave that up to you.
>
> Regards,
> MS
>
>
>
>
>
>
>
> -----Original Message-----
> From: Philip [mailto:pschmi02@x...]
> Sent: Friday, 5 December 2003 5:48 PM
> To: mfsloane@xxxx
> Subject: RE: [Metastockusers] Writing code for "the first time an
event
> happens"
>
>
> Mike,
>
> Many thanks for your help! I'll need about a week or ten days to
work
> with your formulas. SPECIAL thanks for the tip about the "Using
latches
> in MS.doc" -- that might be just what I need.
>
> If you could spare another few minutes, some questions have come to
> mind.
>
> 1. Even with my limited grasp of the syntax it seems that if I
wanted to
> vary my trend definition, all I would have to do is replace the
> statement following Trend:=, right? But what about changing the
trigger?
> Say my trigger is some formula I've cooked up in the indicator
builder
> called . . . I don't know . . . "TURN" consisting of an oversold
StoRSI
> or some price pattern. Would I simply substitute "TURN" instead of
> Cross(Mov(C, 8, E), Mov(C, 13, E)); following Trigger:=? And would
this
> entail making a change to the next to last line, the line that
currently
> reads: Signal:= Cross(Test, 1.5);?
>
> 2. The syntax you''ve written could be used both as an indicator or
an
> exploration filter, correct?
>
> TIA,
>
> Philip
>
>
>
> "urn:schemas-microsoft-com:office:office">
> Philip,
>
> The previous post from metarockx prompted me to take another look
at the
> code I posted earlier and I found a condition that is not in line
with
> your spec.
>
> As written, the signal plot will spike if the 8 EMA is already
above the
> 13 EMA when the 55 EMA turns up; this can be solved by changing the
> Trigger condition from " > " to a "cross" condition, as below:
>
> Trend:= Mov(C, 55, E) > Ref(Mov(C, 55, E), -1);
> Trigger:= Cross(Mov(C, 8, E), Mov(C, 13, E));
>
> Test:= If(PREV = 0,
> If(Trend, 1, 0),
> If(Trigger, 2,
> If(Trend + Trigger = 0, 0, PREV)));
>
> Signal:= Cross(Test, 1.5);
>
> Signal
>
> Good trading,
> Mike
>
>
>
> -----Original Message-----
> From: Philip [mailto:pschmi02@x...]
> Sent: Saturday, 6 December 2003 7:31 AM
> To: Metastockusers@xxxxxxxxxxxxxxx
> Subject: RE: [Metastockusers] Writing code for "the first time an
event
> happens"
>
>
>
> Thanks, Mike, your explanations are great! I don't always do as
good a
> job
> of communicating these things clearly, but when I posted originally
I
> was
> trying to find a way to run an exploration for an event which has
> occurred
> for the first time. More specifically, the first retracement in a
trend,
>
> regardless of how the trend (or the retracement) is defined.
>
> In the past, I've simply created an indicator and then "called" it
in
> the
> symbol or highlight section of an expert. So I would have written
> something
> like:
>
> Fml( "Trenddefinition") and Fml("Retracement") . . . and then
chosen a
> buy
> arrow or some such. When both obtain I get my signal. Wouldn't that
give
> me
> the same result as the code you and metarockx have written? But now
I'm
> trying to isolate that first retracement and explore for that first
> event
> alone -- and I'm stumped.
>
> In terms of watching the way price moves, it seems that the first
> retracement after a trend kicks in has a better chance of leading
to a
> profitable trade than later retracements. I'm still at the "hunch"
stage
>
> about this, but I'd like to investigate further. So how do I nail
(i.e.
> explore for) that first retracement? Say my trend definition has
been
> true
> since October 1, 2003 (or even just since yesterday, for that
matter)
> and
> today, for the first time, my retracement definition is met. Using
your
> .jpg as an example, I'd like to run an exploration that would
identify
> only
> such retracements as the one signal both you and metarockx have
> identified
> early in July -- the first signal of its kind after the trend
definition
>
> has kicked in.
>
> I'm afraid I didn't do a good job of expressing this in my initial
post.
>
> Philip
>
>
>
>
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