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You can just use this:
Chg = Close - Ref( Close, -1 );
It is usually easier to just let AB process the whole array at once - see
"Understanding how AFL works" in the helpsection for more info.
Steve
----- Original Message -----
From: "traderkirk7" <traderkirk@xxxxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Friday, June 10, 2005 6:50 PM
Subject: [amibroker] simple code question
>I have had Amibroker for awhile now but continued to use TradeStation
> because that is what I have been used to and it worked for most of
> what I needed. I decided to dust off Amibroker and see what it can
> do but I am having a coding problem. I want to plot a simple
> indicator that measures change.
>
> In TS, the formula is a relatively simple:
>
> Chg = Close - Close[1];
> Plot1(Chg);
>
> In Amibroker what I have is:
>
> for( i = 1; i < BarCount; i++ )
> {
> Chg = Close[ BarCount - 1 ] - Close[ BarCount - 2 ];
> }
> Plot (Chg, "Change", colorBlue, styleLine);
>
> The problem is that the indicator's value is correct on the last bar
> of the chart, but it plots that same value on every bar preceding it,
> so all that results is a straight line. I tried it with the Plot
> statement inside the For loop but then all I get is a straight line
> with many instances of the same value (obviously due to the loop).
>
> I figured I could work it out from the code for Rate of Change, but
> that is simply coded with the 'ROC' function, and the code for the
> functions are not available to my knowledge.
>
> Any help is appreciated, thanks.
>
>
>
>
>
> 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
>
> For other support material please check also:
> http://www.amibroker.com/support.html
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
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