[amibroker] Re: Please help with an exploration code

["possum51au" <tempest@xxxxxxxxxxxxxx>]

Hi Patrick, Thank you very much for your generosity ? I tried for ages to write that code ? now I understand how it is done. You saved me from giving up!

Cheers

Raine
--- In amibroker@xxxxxxxxxxxxxxx, "NW Trader" <pk47hargus@xxx> wrote:
>
> Hi Raine,
> 
> This is not difficult except for your definition of one year.  The number of trading days differs from market to market, however a general rule of thumb might be 250 days. In the US, I have 253 days in this year, however one year back it might be a bit less depending on holidays, so I generally use 250 for convenience.  If you have a different number, substitute it for the 250 below.
> 
> The exploration would look something like this (I'm not writing this in AB, but don't think it will have errors unless introduced by line wrapping):
> 
> 
> // =========== Exploration Code
> Filter = 1;
> 
> addcolumn( c, "CLOSE", 3.2, colorwhite, colorblue);
> addcolumn( ref(c, -250), "Close 1 Year Ago", 3.3, coloryellow, colordarkgreen);
> addcolumn( c - ref(c,-250),"Points Delta over Year", 3.2, colorblue, coloryellow);
> addcolumn( ROC(C, 250), "% Change over year), 3.2, colorwhite, colordarkred);
> // ================ End Code ==================
> 
> If you want to make a parameter for the period change the number 250 in the above code to Per and place the following parameter at the top of the code:
> 
> Per = Param("Period to Check", 250, 1, 250, 1);
> 
> Enjoy!! 
> 
> Peace and Justice   ---   Patrick
>   ----- Original Message ----- 
>   From: possum51au 
>   To: amibroker@xxxxxxxxxxxxxxx 
>   Sent: Tuesday, February 02, 2010 9:07 PM
>   Subject: [amibroker] Please help with an exploration code
> 
> 
>   I am trying to write an exploration which returns the closing price one year ago.  I know it will be simple but I seem to have a mental block.
>   Ideally I would like it to calculate the difference between today's close and that 1 year previous close, and present it as a percentage gain or loss.
>   Thanks in advance for any help
>   Raine
> 
> 
> 
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------------------------------------

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