[amibroker] AB built-in stochastic vs. my own: the same code, different picture

[bromba <bromba@xxxxxxxxxxxx>]

hello,

I wanted to create my own Stochastic. I set in preferences -> indicators 
-> stochastic: range=21, %Ksmooth=1, %Dsmooth=14. then I plotted it and 
treated as a "reference". the next thing was creating my own stochastic. 
I just copied the built-in code, plotted it and.. result is different. 
why? here is built-in code:

range = Prefs( 14 );
_N( ranstr = "("+WriteVal( range, 1.0 )+")" );
Plot( StochK(range), "Stochastic %K"+ranstr, -8 );
Plot( StochD(range), "Stochastic %D"+ranstr, -9 );

to obtain the same result I had to declare missing values explicitly:

range = Prefs( 14 );
_N( ranstr = "("+WriteVal( range, 1.0 )+")" );
Plot( StochK(range,1), "Stochastic %K"+ranstr, -8 );
Plot( StochD(range,1,14), "Stochastic %D"+ranstr, -9 );

could you point me to right place in AB help file that explains that 
different behaviour? I can't find it.. is it that AB treats the same 
code within "built-in" section differently then within "custom"? does it 
affect all AFL scripting that user has to provide all missing values to 
obtain the same results?

cheers,
BM

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