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Hmmm, well I tried:
vSARUp = Ref(SAR(0.02,0.2),-1) >= Ref(High,-1) AND SAR(0.02,0.2) < Low
AND closeAll;
if (vSARUp[0])
and this didn't get any errors. I've no idea why, since vSARUp still
contains this mix of arrays and numeric values. Doesn't seem right to me.
Martin
Martin Cooney wrote:
> 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
>>
>>
>> Please note that this group is for discussion between users only.
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