[amibroker] Inefficient loop

["kevinkee20" <kevinkee20@xxxxxxxxx>]

Hi, 
I'm trying to write an AFL to draw support trendline (PS. I'm aware that there is existing trendline AFLs in the library).  There is a section where I can't think of other ways but to use loop (probably should be defined as a loop in another loop).  This slows down the AFL speed tremendously.  Would anyone be able to think of a better way to improve the following ?

The logic of the code is this:  The first point of the support/trend line has been identified as (SupportX1, SupportY1).  The following code then attempts to find the next point (SupportX2, SupportY2) of the trendline.  A bar-by-bar search approach is adopted (hence the loop).  The bar with the Low that forms the lowest gradient line is the target here (assigned SupportX2). 

Any help is appreciated.
Kevin


gradient0 = ( Ref(L, -1) - SupportY1) / (-1 + SupportX1);

for (i=1; i<BarCount; i++)
{
   loopstartX = 1;
   while(loopstartX < (SupportX1[i]))
   {
   gradient = ( Ref(L,-loopstartX) - SupportY1 )/(-loopstartX + SupportX1);
   if ((gradient[i]) < (gradient0[i]))
      {
      gradient0[i] = gradient[i];
      SupportX2[i]= loopstartX;
      }
   nxsup00 = nxsup00 + 1;
   }
}




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