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John,
apparently it makes no difference. I am used to
doing it this way because I used to program with IDL. I thought that certain
arrays are known arrays to AFL like Buy, Sell etc and do not need to be
initialised. However, I thought that if I only use BuyAdjusted = 0; that
Amibroker would think it is not an array. Apparently not.
But the way I do it is not wrong however it is
indeed unnecessary ... have to get used to the fact that AFL is an array
oriented language.
thanks,
Ed
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
john gibb
To: <A title=amibroker@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Sunday, August 08, 2004 10:39
PM
Subject: Re: [amibroker] while/for loop
compiler error 3 question
Hi Ed,
What problem might you encounter if you
simply do:
BuyAdusted=0;
?
instead of:
BuyAdusted=Buy;
BuyAdusted=0;
thanks,
-john
<BLOCKQUOTE dir=ltr
>
----- Original Message -----
<DIV
>From:
ed nl
To: <A title=amibroker@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Sunday, August 08, 2004 10:20
AM
Subject: Re: [amibroker] while/for loop
compiler error 3 question
O, but this has a reason. First I make an array
BuyAdjusted:
1) BuyAdjusted = Buy;
and then I make sure that I only have zeros in
this array
2) BuyAdjusted = 0;
so now I have an array BuyAdjusted that has the
same length as Buy and it is filled with zeros only,
rgds, Ed
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
john
gibb
To: <A
title=amibroker@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Sunday, August 08, 2004 7:14
PM
Subject: Re: [amibroker] while/for
loop compiler error 3 question
Hi Ed,
Here is an example of the double
initialization I think Gary refers to:
BuyAdjusted = <FONT
color=#000000>Buy; BuyAdjusted =
0<FONT
color=#000000 size=2>;
<FONT color=#000000
size=2>
<FONT
face=Arial>-john
<BLOCKQUOTE dir=ltr
>
----- Original Message -----
<DIV
>From:
ed nl
To: <A
title=amibroker@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Sunday, August 08, 2004 9:42
AM
Subject: Re: [amibroker] while/for
loop compiler error 3 question
hi
Gary,
I'm not sure what you mean that I
initialize these arrays twice. Please show me where. The reason I
initialize the arrays is to make sure the arrays exist and have the same
length as the Buy array and are filled with only zeros.
I add the rest of the program which
is a LONG only test program for a N-Bar stop procedure included in a
system (instead of the Applystop).
Could be I initialised them twice
so I like to see how to avoid that, but this way I know for sure the
arrays exist and that they are empty.
regards, Ed
<FONT
color=#800000>
<FONT
color=#800000>
<FONT
color=#800000>
<FONT
color=#800000>procedure
ttt(Buy<FONT
color=#000000>,BuyPrice<FONT
color=#000000>,Open<FONT
color=#000000>,High<FONT
color=#000000>,Low<FONT
color=#000000>,<FONT
color=#000000>Close<FONT face="Courier New"
color=#000000 size=2>,nbar) { <FONT face="Courier New"
color=#008000 size=2>/* Jul 2004 */<FONT
face="Courier New">
global<FONT
color=#000000> <FONT
color=#000000>Sell<FONT
face="Courier New">; <FONT
color=#800000>global <FONT
color=#000000>SellPrice<FONT
face="Courier New">; <FONT
color=#800000>global<FONT
face="Courier New"> BuyAdjusted;
global<FONT
face="Courier New"> BuyPriceAdjusted;
// initialise arrays
<FONT
face="Courier New"><FONT
color=#000000>SellPrice = <FONT
color=#000000>BuyPrice; <FONT
color=#000000>SellPrice = <FONT
color=#ff00ff>0<FONT
size=2>; <FONT
color=#000000>Sell = <FONT
color=#000000>Buy; <FONT
color=#000000>Sell = <FONT
color=#ff00ff>0<FONT
size=2>; BuyAdjusted = <FONT
color=#000000>Buy; BuyAdjusted =
0<FONT
face="Courier New">;
BuyPriceAdjusted = <FONT
color=#000000>BuyPrice;
BuyPriceAdjusted = <FONT
color=#ff00ff>0<FONT
size=2>; <FONT
color=#800000>for (i = <FONT
color=#ff00ff>0; i < <FONT
color=#000000>BarCount<FONT
face="Courier New">; i++) {
//
<FONT face="Courier New"
size=2> <FONT
size=2>if
(Buy[ i ]
== 1<FONT
face="Courier New">)
{
//
buy at open <FONT
face="Courier New"
size=2> BuyAdjusted[ i ] =
<FONT face="Courier New" color=#ff00ff
size=2>1<FONT
color=#000000>;
BuyPriceAdjusted[ i ] =
Open<FONT
face="Courier New">[ i ];
//
find a sell position + sellprice <FONT
color=#000000><FONT face="Courier New"
size=2> <FONT
face="Courier New"><FONT
color=#800000>for (j = i; j <
BarCount<FONT
face="Courier New">; j++) {
<FONT
color=#008000>// nbar stop exit at the open <FONT
color=#000000><FONT face="Courier New"
size=2>
<FONT face="Courier New" color=#800000
size=2>if<FONT
color=#000000> ((j - i) == nbar) {
<FONT
color=#000000>Sell[ j ] = <FONT
color=#ff00ff>5<FONT
size=2>;
<FONT
color=#000000>SellPrice[ j ] =
Close<FONT
face="Courier New">[ j ];
<FONT
color=#008000>// enter i-loop starting from the last sell
<FONT face="Courier New"
size=2> i
= j;
<FONT
face="Courier New" color=#008000 size=2>// escape from loop <FONT
color=#000000><FONT face="Courier New"
size=2> j
= <FONT face="Courier New" color=#000000
size=2>BarCount<FONT
color=#000000>;
}
}
}
} } // end procedure
<FONT
face="Courier New" color=#008000 size=2>// initial settings for
portfolio trading (also see Settings window) <FONT
color=#000000><FONT
color=#0000ff>SetBarsRequired(<FONT
color=#ff00ff>10000,<FONT
color=#ff00ff>10000<FONT
size=2>); <FONT
color=#0000ff>SetOption(<FONT
color=#ff00ff>"MaxOpenPositions",
250<FONT
face="Courier New"> ); <FONT
color=#000000>PositionSize =
-15<FONT
face="Courier New">; <FONT
color=#0000ff>SetTradeDelays(<FONT
color=#ff00ff>1,<FONT
color=#ff00ff>1,<FONT
color=#ff00ff>1,<FONT
color=#ff00ff>1<FONT
size=2>); <FONT
color=#0000ff>SetOption(<FONT
color=#ff00ff>"AllowSameBarExit",<FONT
color=#000000>True<FONT
face="Courier New">); <FONT
color=#0000ff>SetOption(<FONT
color=#ff00ff>"AllowPositionShrinking"<FONT
color=#000000>,<FONT
color=#000000>True<FONT
face="Courier New"> ); <FONT
color=#0000ff>SetOption(<FONT
color=#ff00ff>"ActivateStopsImmediately"<FONT
color=#000000>,<FONT
color=#000000>True<FONT
face="Courier New"> );
// initial settings of the
variables <FONT
face="Courier New" size=2>nb = <FONT face="Courier New"
color=#ff00ff size=2>1<FONT
color=#000000>; tt = NumDownBars = <FONT
color=#0000ff>BarsSince( <FONT
color=#000000>C >= <FONT
color=#0000ff>Ref(<FONT
color=#000000>C,-<FONT
color=#ff00ff>1<FONT
size=2>) ); <FONT
color=#000000>Buy = tt >=
3<FONT
face="Courier New">;
// build in the trade delay
<FONT
face="Courier New"><FONT
color=#000000>Buy = <FONT
color=#0000ff>Ref(<FONT
color=#000000>Buy,-<FONT
color=#ff00ff>1<FONT
size=2>); <FONT
color=#000000>BuyPrice = <FONT
color=#000000>Open<FONT
face="Courier New">;
// calculate sell positions
<FONT face="Courier New"
size=2>ttt(<FONT
color=#000000>Buy,<FONT
color=#000000>BuyPrice,<FONT
color=#000000>Open,<FONT
color=#000000>High,<FONT
color=#000000>Low,<FONT
color=#000000>Close<FONT
face="Courier New">,nb);
Buy<FONT
face="Courier New"> = BuyAdjusted;
BuyPrice<FONT
face="Courier New"> = BuyPriceAdjusted;
// move back the
arrays<FONT
color=#000000> Buy<FONT
color=#000000> = Ref<FONT
color=#000000>(Buy<FONT
color=#000000>,1<FONT
face="Courier New">); <FONT
color=#000000>Sell = <FONT
color=#0000ff>Ref(<FONT
color=#000000>Sell,<FONT
color=#ff00ff>1<FONT
size=2>); <FONT
color=#0000ff>Plot(<FONT
color=#000000>C,<FONT
color=#ff00ff>"C",<FONT
color=#ff00ff>1,<FONT
color=#ff00ff>64<FONT
size=2>); <FONT
color=#0000ff>PlotShapes(<FONT
color=#000000>shapeUpArrow<FONT
color=#000000>*Buy<FONT
color=#000000>,colorWhite<FONT
color=#000000>, layer = 0<FONT
color=#000000>, yposition = <FONT
color=#000000>BuyPrice, offset =
0<FONT
face="Courier New"> ); <FONT
color=#0000ff>PlotShapes(<FONT
color=#000000>shapeDownArrow<FONT
color=#000000>*Sell<FONT
color=#000000>,colorYellow<FONT
color=#000000>, layer = 0<FONT
color=#000000>, yposition = <FONT
color=#000000>SellPrice, offset =
0<FONT
face="Courier New"> ); <FONT
color=#000000>Title=<FONT
color=#0000ff>Name()+ <FONT
color=#ff00ff>", O: "+<FONT
color=#0000ff>WriteVal(<FONT
color=#000000>O)+ <FONT
color=#ff00ff>", H: "+<FONT
color=#0000ff>WriteVal(<FONT
color=#000000>H)+ <FONT
color=#ff00ff>", L: "+<FONT
color=#0000ff>WriteVal(<FONT
color=#000000>L)+ <FONT
color=#ff00ff>", C: "+<FONT
color=#0000ff>WriteVal(<FONT
color=#000000>C<FONT
face="Courier New">);
PositionScore<FONT
color=#000000> = tt * (50<FONT
color=#000000>-StochK<FONT
color=#000000>(8<FONT
face="Courier New">));
Filter<FONT
color=#000000> = 1<FONT
face="Courier New">; <FONT
color=#0000ff>AddColumn(<FONT
color=#000000>Buy,<FONT
color=#ff00ff>"Buy"<FONT
size=2>); <FONT
color=#0000ff>AddColumn(<FONT
color=#000000>Sell,<FONT
color=#ff00ff>"Sell"<FONT
size=2>); <FONT
color=#0000ff>AddColumn(<FONT
color=#000000>PositionScore<FONT
color=#000000>,<FONT
color=#ff00ff>"PositionScore"<FONT
color=#000000>);
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
<A title=serkhoshian777@xxxxxxxxx
href="">Gary A. Serkhoshian
To: <A
title=amibroker@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Sunday, August 08, 2004
4:31 PM
Subject: Re: [amibroker]
while/for loop compiler error 3 question
Ed,
I enjoyed reading through your code, but was confused as to why
you initialized the following arrays twice. Can't they all be
set to zero from the start?
Thanks,
Gary
// initialise arrays
<FONT
color=#000000>SellPrice =
BuyPrice;
SellPrice
= 0<FONT
face="Courier New">; <FONT
color=#000000>Sell = <FONT
color=#000000>Buy; <FONT
color=#000000>Sell = <FONT
color=#ff00ff>0<FONT
face="Courier New">; BuyAdjusted =
Buy;
BuyAdjusted = 0<FONT
face="Courier New">;
BuyPriceAdjusted = <FONT
color=#000000>BuyPrice;
BuyPriceAdjusted = 0<FONT
size=2>; ed nl
<ed2000nl@xxxxxxx> wrote:
<BLOCKQUOTE class=replbq
>
hi,
the error you get is because you use
whole arrays in the loop. So your exitcondition is probably defined
as an array. For instance if you define:
exitCondition = StochK(8) > 90;
then exitCondition is an array and in
the loop you have to specify the element using exitCondition[ i
]
For your second question I add an
example. You see that I have a j-loop within the
i-loop. To exit the j-loop is put j = BarCount.
Before I do that I change i to the value I want it to be. So the
answer is yes one can change i within the
loop.
rgds, Ed
<FONT
color=#800000>procedure
ttt(Buy<FONT
color=#000000>,<FONT
color=#000000>BuyPrice<FONT
color=#000000>,Open<FONT
color=#000000>,High<FONT
color=#000000>,Low<FONT
color=#000000>,<FONT
color=#000000>Close<FONT
face="Courier New" color=#000000 size=2>,nbar) {
/*
Jul 2004 */<FONT
size=2> <FONT
color=#800000>global <FONT
color=#000000>Sell<FONT
face="Courier New">;
global<FONT
color=#000000> <FONT
color=#000000>SellPrice<FONT
face="Courier New">;
<FONT
color=#800000>global<FONT
face="Courier New"> BuyAdjusted;
<FONT
color=#800000>global<FONT
face="Courier New">
BuyPriceAdjusted; // initialise
arrays <FONT
face="Courier New"><FONT
color=#000000>SellPrice =
BuyPrice<FONT
color=#000000>; <FONT
color=#000000>SellPrice =
0<FONT
face="Courier New">;
Sell<FONT
color=#000000> = Buy<FONT
color=#000000>; Sell<FONT
color=#000000> = <FONT
color=#ff00ff>0<FONT
size=2>; BuyAdjusted = <FONT
color=#000000>Buy; BuyAdjusted =
0<FONT
face="Courier New">;
BuyPriceAdjusted = <FONT
color=#000000>BuyPrice;
BuyPriceAdjusted = <FONT
color=#ff00ff>0<FONT
size=2>; <FONT
color=#800000>for (i =
0; i <
BarCount<FONT
face="Courier New">; i++) {
//
<FONT
face="Courier
New" size=2> <FONT
face="Courier New"><FONT
color=#800000>if (<FONT
color=#000000>Buy[ i ] ==
1<FONT
face="Courier New">)
{
<FONT
color=#008000>// buy at open <FONT
color=#000000><FONT face="Courier New"
size=2> BuyAdjusted[ i ] =
<FONT face="Courier New" color=#ff00ff
size=2>1<FONT
color=#000000>;
BuyPriceAdjusted[ i ] =
Open<FONT
face="Courier New">[ i ];
<FONT
color=#008000>// find a sell position + sellprice
<FONT
face="Courier New"
size=2> <FONT
face="Courier New"><FONT
color=#800000>for (j = i; j <
BarCount<FONT
face="Courier New">; j++) {
<FONT
color=#008000>// nbar stop exit at the open
<FONT
face="Courier New"
size=2>
<FONT face="Courier New" color=#800000
size=2>if<FONT
color=#000000> ((j - i) == nbar) {
<FONT
color=#000000>Sell[ j ] =
5<FONT
face="Courier New">;
<FONT
color=#000000>SellPrice[ j ] =
Close<FONT
face="Courier New">[ j ];
<FONT
color=#008000>// enter i-loop starting from the last sell
<FONT
face="Courier New"
size=2> i
= j;
<FONT
face="Courier New" color=#008000 size=2>// escape from loop
<FONT face="Courier New"
size=2> j
= <FONT face="Courier New" color=#000000
size=2>BarCount<FONT
size=2>;
}
}
}
} } // end procedure
<BLOCKQUOTE
>
OK, this compiler/interpreter
behaviour is confusing me:here is a part of my code that
is generating compile Error 3, "for, while, if statement can
only use boolean or numeric variables" etc.
The strange part is that the for loop is ok but the
while generates this error as shown AND also if I comment the
(exitCond == False) part and uncomment the (n < BarCount)
part. (error goes away if I change BarCount to 10, e.g., with
(exitCond == False) commented out).2nd Question has to do
with being able to change i in the middle of the for loop, as
I do in the last statement. Is this possible or will i
continue from where it left off????for (i = Length+1; i
< BarCount;
i++){
exitCond =
False;
n =
i;
inTrade = False;
while ((exitCond == False))// AND
(n <
BarCount))
{
n = n +
1;
}//while
i = n;}// forCheck
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