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Yep, I certainly got the error and looked at the Help file which you
also included below. I have no doubt it's my fault in mixing arrays and
numeric values.
All I know is I've got these 3 conditions that if True, I want to do
this other stuff. No barcount 'for' loop stuff - maybe down the track
once I work out what I need it for :)
Again, apologies for not understanding stuff that you guys take for
granted. Despite Graham's wonderful reply, I still am uncertain what to do.
Martin
Joe Landry wrote:
> First thing I can spot is you're mixing arrays and single
> expresssion/numeric values. Usually syntax checker or precompiler spots
> that right off with an Error 6. If you want to prove it to
>
> yourself insert the following code in AutoAnalysis, select a single
> ticker, set number of bars for 20 or some and you'll see that both A and
> B are arrays with B being the previous bars SAR. Note that C is an array
> also of true and false.when the conditions are met. This is a slow and
> brute force way of putting an expression together but hope this helps
> when you see what's happening.
>
> A = SAR(0.02,0.2);
>
> B = Ref(A,-1);
>
> * *
>
> *C* = B >= Ref(*High*,-1);
>
> * *
>
> *Filter* =1;
>
> AddColumn(a,"A");
>
> AddColumn(b,"B");
>
> AddColumn(*C*,"C");
>
> The < if > statements are for single numeric elements/expressions and
> for arrays you need to use IIF.
>
> JOE
>
>
>
>
> *Common Coding mistakes in AFL*
>
> This document presents most common mistakes and problems that users
> encounter when writing their custom formulas. Please read carefully to
> avoid making similar error
>
> *-----------------------------------------------------------------------------------------------------------------------*
>
> *if-else statement needs boolean (or single numeric expression), not array*
>
> The *if* keyword executes /statement1/ if /expression/ is true
> (nonzero); if *else* is present and /expression/ is false (zero), it
> executes /statement2/. After executing /statement1/ or /statement2/,
> control passes to the next statement. E/xpression /must be boolean (
> True/False) type (so it CANNOT be ARRAY because there would be no way do
> decide whether to execute /statement1/ or not, if for example array was:
> [True,True,False,.....,False,True] )
>
> *if*( expression )
> statement1
> *else*
> statement2
>
> *EXAMPLE*
>
> |*if*( *Close* > *Open* ) // WRONG
> Color = *colorGreen*; //statement 1
> *else*
> Color = *colorRed*; //statement 2
>
> Plot(*Close*,"Colored Price",Color,*styleCandle*);|
>
>
>
> ----- Original Message -----
> *From:* Martin Cooney <mailto:martin@xxxxxxxxxxxxx>
> *To:* Amibroker General Forum <mailto:amibroker@xxxxxxxxxxxxxxx>
> *Sent:* Thursday, March 02, 2006 8:10 PM
> *Subject:* [amibroker] syntax error help
>
> Hi Guys,
>
> Sorry to do this so often but I'm having trouble working out the best
> way to do some Metatrader code conversion into AB and I'm getting a
> syntax error that my present coding level is having problems in working
> around.
>
> MT4 Code:
>
> if (iSAR(NULL,0,0.02,0.2,1) >= High[1] &&
> iSAR(NULL,0,0.02,0.2,0) < Low[0] &&
> closeAll)
>
> SAR of previous bar equal or greater than High of previous AND SAR of
> current bar is less than Low of current bar and the Boolean variable
> closeAll is True. Essentially, Sar was above and now below.
>
> My Conversion to AB:
>
> if (Ref(SAR(0.02,0.2),-1) >= Ref(High,-1) &&
> SAR(0.02,0.2) < Low &&
> closeAll)
>
> This gives me an Error 6. Condition in IF, WHILE, FOR statements has to
> be Numeric or Boolean type. You can not use array here, please use []
> (array subscript operator) to access array elements.
>
> I know it's something stupid that I've not yet experienced and stored
> away yet so any help would be appreciated (as always).
> Martin
>
>
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