What happens when new data arrives then?
Joseph Biran
____________________________________________
From:
amibroker@xxxxxxxxxxxxxxx [mailto:amibroker@xxxxxxxxxxxxxxx] On Behalf Of Fred
Sent: Monday, January 30, 2006
8:49 PM
To: amibroker@xxxxxxxxxxxxxxx
Subject: [amibroker] Re:
Initializing Variables once at the start of the program
TradeStation easy language is processed from to top to bottom a bar
at a time ...
AmiBroker AFL is processed from top to bottom with
each statement
being executed ONCE and ONLY ONCE ... NOT ONCE PER
BAR ...
Unless you build your own Do / While / For Loops
and subscript the
ARRAYS then typically each statement works on the
entire ARRAY ...
For example ...
If I write the AFL
BS = Ref(H, -1) * 1.001;
SS = Ref(L, -1) * 0.999;
Buy = C > BS;
Sell = C < SS;
Then each of the above statements will be
evaulated once ... not once
per bar ...
The first statement will cause an array to be
built with each value
along the array being 1.001 * The previous bars
high. Once this
statement is executed or evaluated once it will
never be executed or
evaluated again.
The second statement will cause an array to be
built with each value
along the array being 0.999 * The previous bars
low.
The third and fourth statement evaluate whether
buys and sells take
place over the entire history of data that is
being looked at ...
again by being evaluated ONCE ... NOT ONCE PER BAR
...
I came from TS as well ... years and years of it
... it is at first
difficult to visualize the concept of array
arithmetic but in time
you'll get used to it ...
--- In amibroker@xxxxxxxxxxxxxxx,
"clarusinnovation" <mfishburn@xxxx>
wrote:
>
> Hi,
>
> I want to initialize a variable CurrentBar at
the start of my
program
> once to 0 - meaning I haven't processed this
bar yet. (and a lot of
> other variables I want too)
>
> I don't know how or where to put the
variables so they won't get
> initialized every time through the program. I
want to keep their
> values as I climb up through the bars.
>
> each bar that counts up, I want to increment
this counter.
>
> I tried StaticVariables, but they don't seem
to work. How do I
> initialize them ONCE and then increment them
from there ?
>
> Please don't tell me to read the manual, I
have been up and down
it,
> reading Understanding AFL, it is taking me
days to do the simplest
> things...... and it isn't working for
me. I came from Tradestation
> and I could understand bar flow, with Ami I
don't.
>
> Please just tell me what to do, and where to
put the code.
>
> I tried initalizing the variable in a
#Include_ONCE file, that
didn't
> work.
>
> Thanks a lot, it is very frustrating.
>
> Mark
>
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