[d2n-analysis-talk] BB TDC cuts

[MATTHEW R POSIK]

just recheck the Ndata.DL.foo histograms, and it does have a hit at
DL.foo[16]. But when I did a make selector and checked the array length that
it assigned to DL.BBcerT14[4],DL.BBcerT12[10],DL.BBcerT19[6],DL.BBcerT20[12]
and the rest had DL.BBcerTxx[16].

 But checking the histograms all have a hit at 16(not a real event, prob.
just a memory thing like you said). So I do not know how make selector is
determining the arrays.

-matt
On Wed, May 26, 2010 at 6:20 PM, Brad Sawatzky <brads at jlab.org> wrote:

>
> On Wed, 26 May 2010, MATTHEW R POSIK wrote:
>
> > I just checked the TDC hits and it seems like most of the (15 of the
> > TDCs) are arrays of 16 and of the other  TDCs with array length less
> > than 16, only one was less than the 6 hits that I was looping over
> > (For the H2 elastic runs). So I just fixed that. On the TDCs with
> > array length 16, there seems to be events in hits 1-6 and then a large
> > gap until hit 16 where there is what looks to be one event.
>
> That doesn't make sense to me.  All of the DL class variables have
> a hardcoded hit array with 16 elements (see MxHits in THaDecData.C).
> The 1877s have a hit buffer depth that is typically programmed to be 6.
>
> If NData.DL.foo == X, then the data elements
>    DL.foo[0] .. DL.foo[X-1] are meaninful data
>    DL.foo[-1]               is god knows what (indexing out of bounds)
>    DL.foo[X] .. DL.foo[15]  is god knows what (old data or whatever was
>                                in memory when the array was
>                                instantiated)
>    DL.foo[16]               is god knows what (indexing out of bounds,
>                                possibly the first hit in the array
>                                allocated for the next DecData variable.
>                                Who knows...)
>
> You say there are DecData hit arrays that have a length other than 16?
> Are those associated with the DecData VDC or TrigBit stuff?
>
> -- Brad
>
> --
> Brad Sawatzky, PhD <brads at jlab.org>  -<>-  Jefferson Lab / Hall C / C111
> Ph: 757-269-5947  -<>-  Fax: 757-269-5235  -<>- Pager: brads-page at jlab.org
> The most exciting phrase to hear in science, the one that heralds new
>  discoveries, is not "Eureka!" but "That's funny..."   -- Isaac Asimov
>



-- 
Matthew Posik
Email: posik at temple.edu
Temple University Physics Dept.
Office: BA-319
Office #:  215-204-1331
WebSites:
Temple:
http://quarks.temple.edu/
d2n:
http://hallaweb.jlab.org/experiment/E06-014/
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