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Using if (vSARUp[0]) means you are only refeenceing the first bar in
the array (barindex()==0) so it is a sigla value not the array of
values
you need to give us more of the AFL to show how you are using this condition
--
Cheers
Graham
AB-Write >< Professional AFL Writing Service
Yes, I write AFL code to your requirements
http://e-wire.net.au/~eb_kavan/ab_write.htm
On 3/3/06, Martin Cooney <martin@xxxxxxxxxxxxx> wrote:
> 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.
> >>
> >> To get support from AmiBroker please send an e-mail directly to
> >> SUPPORT {at} amibroker.com
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