How to understand this codes?

[[Deleted]]

How to understand this codes?

for(shift=Bars-ExtDepth; shift>=0; shift--)
{
val=Low[iLowest(NULL,0,MODE_LOW,ExtDepth,shift)];
if(val==lastlow) val=0.0;
else
{
lastlow=val;
if((Low[shift]-val)>(ExtDeviation*Point)) val=0.0;
else
{
for(back=1; back<=ExtBackstep; back++)
{
res=ExtMapBuffer[shift+back];
if((res!=0)&&(res>val)) ExtMapBuffer[shift+back]=0.0;
}
}
}

ExtMapBuffer[shift]=val;

Thanks

[Piotr]

za malo danych podales