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Re: How to remove a candidate [message #14552 is a reply to message #14551]

Thu, 28 March 2013 12:03

donghee
Messages: 385
Registered: January 2009
Location: Germnay

first-grade participant

From: *dip.t-dialin.net

Dear PANDAroot users,

I would like to confirm Klaus's suggestion and report to get better understanding of our example code in analysis macro directory (macro/run/tdrct/).

I have tested a function, which will remove low energetic photon in the "Neutral candidate" by EMC energy cut as an example.
This function has a bug as people mentioned because it does not look all contents inside the candidate list,
they stop before arriving end of list due to wrong count in the part of "ii=l-n_removed".
So simpy you could not reach to the end of list because will skip last part according to reduced counts during remove process.

Quote:

------------------------------------------------------------------------ --------------------------------------

//this method is wrong!!!
int n_removed=0; int ii=0;
for (l=0;l<neutral2.GetLength();++l) {
ii=l-n_removed;
if(neutral2[ii].GetMicroCandidate().GetEmcRawEnergy() < 0.01 ){
neutral2.Remove(neutral2[ii]);
n_removed++;
}
}
------------------------------------------------------------------------ --------------------------------------

So change the length as total = neutral2.Getlength(), works fine.

Quote:

------------------------------------------------------------------------ --------------------------------------

//this method works
int total = neutral2.Getlength();
int n_removed=0; int ii=0;
for (l=0;l<total;++l) {
ii=l-n_removed;
if(neutral2[ii].GetMicroCandidate().GetEmcRawEnergy() < 0.01 ){
neutral2.Remove(neutral2[ii]);
n_removed++;
}
}
------------------------------------------------------------------------ --------------------------------------

In order to correct example macros in tutorials/feb12/,
one should alterantively change from [ii] to [ii--] and here you don't need to use n_removed++ any more.
This function will check all contents in the list and reach end of the list as we want.

Quote:

------------------------------------------------------------------------ --------------------------------------

//this method is correct!!!
for (ii=0;ii<neutral3.GetLength();++ii) {
if(neutral3[ii].GetMicroCandidate().GetEmcRawEnergy() < 0.01 ){
neutral3.Remove(neutral3[ii--]);

}
}

------------------------------------------------------------------------ --------------------------------------

Many of analyzer looks and use our example macros without any doubt at the beginnig.
I think that some example codes must to be fixed at least in the pandaroot/macro/

Best wishes,

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[Message index]

		How to remove a candidate By: StefanoSpataro on Wed, 27 March 2013 17:38
		Re: How to remove a candidate By: Klaus Götzen on Wed, 27 March 2013 18:02
		Re: How to remove a candidate By: donghee on Thu, 28 March 2013 12:03
		Re: How to remove a candidate By: StefanoSpataro on Thu, 28 March 2013 14:48
		Re: How to remove a candidate By: Klaus Götzen on Thu, 28 March 2013 15:34
		Re: How to remove a candidate By: Klaus Götzen on Wed, 10 April 2013 08:22

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