[amibroker] some looping help needed .......

["treliff" <treliff@xxxxxxxxx>]

Hoping for some help from Expert Coders.

Code in question is part of a larger code and creates an incredible 
drag, slow chart scrolling etc., understandably so in view of the 
amount of procedures. Hope this can be simplified/improved. 
Appreciate anyone's time to take a look and possibly help me out.

I have an array called "Cycle" that contains integers between
10 and 
50.

I have a function called "Oscillator" that, working on any
Cycle 
array, returns some oscillator, meaning it is limited on up- and 
downside and has Mean approximately zero (like an irregular Sinus).

My challenge is that once Cycle has been generated (earlier in my 
code) I want to calculate the standard deviation of Oscillator over 
all previous bars using strictly the Cycle value of that particular 
Bar (not the Cycle array which has different values).

For example:
- Bar 300 has cycle value 27 
- I create an array with value "27" in all array elements
- then calculate Oscillator of this "27" array
- calculate the standard deviation of all Oscillator values up to Bar 
300
- place this particular value in Bar 300 of a new array
- execute this procedure for all Bars separately

Below is the code I made. TIA for any advice.

// code start

/* NOTE: the first few lines below are IRrelevant, only to create 
random Cycle values between 10 and 50 and some Oscillator function, 
in order for the lower part to work */

function Randomize(a,b)
{ return Random(1)*(b-a)+a ; }

Cycle = int( Randomize(10,50) ) ;

function Oscillator(n) 
{ return Randomize(-50,n) ; } 

/* HERE starts the relevant part */

SetBarsRequired( 100000, 100000 );

function StDevCum(array)
{ return sqrt( ( (BarIndex()+1) * Cum(array^2) - (Cum(array))^2 ) / 
(BarIndex()+1)^2 ); }

/* StDevCum calculates standard deviation of array from Bar zero up 
to current Bar. */

function Cycleconstant(number)
{ for ( i = 0 ; i < BarCount ; i++ )
{ result[ i ] = Cycle[ number ] ; }
  return result; }

/* Cycleconstant fills a complete array with a Cycle array element 
value (number). */

for (j = 0 ; j < BarCount ; j++ )
{ y = StDevCum( Oscillator( Cycleconstant( j ) ) ) ; 
  StDevCumOfOscillator[ j ] = y[ j ] ; }

/* for each separate Bar this first works Oscillator on Cycleconstant 
array of that Bar, then calculates standard deviation (from Bar 0) 
and places result in Bar value (array element) of new array 
StDevCumOfOscillator. */

Plot(0,"",colorBlack);
Plot(Oscillator(Cycle),"Oscillator(Cycle)",colorBlue);
Plot(StDevCumOfOscillator,"StDevCumOfOscillator",colorRed);
GraphZOrder = 1;

// code end





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