@Chupacabra,
And why don’t you say so in your first post then but rather leave much room for guessing?
Have you read here How to use this site ?
/// @link http://forum.amibroker.com/t/counting-problem/2500/5
SetBarsRequired( 10000, 10000 );
iloscBar = Param("iloscBar",14,1,100);
dn = DateNum();
newDay = dn != Ref( dn, -1 );
spV = SparseCompress( newday, V );
spsum = Sum( spV, iloscBar );
csum = SparseExpand( newday, spsum );
Plot( Valuewhen( newday, csum ), "Sum(Volume) at Starts of Day", colorGreen, styleHistogram, Null, Null, 0, 0, -60 );