MT4 how to stop repeat displaying arrows? I just want to display same kind arrow once...

[Eric Lo]

int start()
{
int counted_bars=IndicatorCounted();
//----
int i,limit, top, k;
int signal[];
limit=Bars-1;
if(counted_bars>=1) limit=Bars-counted_bars-1;
if (limit<0) limit=0;
for (i=limit;i>=0;i--) {
if((FullBody(i))&&(isShrinking(i+1))){
if(isNegativeExpanding(i)){
signal[k]=0; // mark current arrow is down
if ((signal[k-1]!=0)||(signal[k-1]==NULL)){ // if last mark arrow is not down the display down arrow
downArrow[i] = Open[i]+SignalGap*Point;
k++; }
}
else if(isPositiveExpanding(i)){
signal[k]=1; // mark current arrow is up
if ((signal[k-1]!=1)||(signal[k-1]==NULL)){ //if last mark arrow is not up then display up arrow
upArrow[i] = Open[i]-SignalGap*Point;
k++;
}
}
}

} // end for

//----
return(0);
}

[William Roeder]

1. 

   ---

2. display same kind arrow once

   if ((signal[k-1]!=0)||(signal[k-1]==NULL)){ // if last mark arrow is not down the display down arrow
      ArrayInitialize(downArrow, EMPTY_VALUE);
      downArrow[i] = Open[i]+SignalGap*Point;