[Frost] initeloss

[Ken Livingston]

Hi Mike, Eugene and all,

The answer to Mike's question is "yes it should be -4.0".

To elaborate a little -  
The set up and use of the eloss rootbeer wrapper are described at.
http://clasweb.jlab.org/rungroups/g9/wiki/index.php/Rootbeer%
2C_including_eloss_and_ExpTable

There is actually a comment in sample_code/elossTest.C

...
//targ_X, targ_y, targ_z, st_offset 
initELoss(0.0,0.0,0.0,2.0);
...

As you can see, it needs the x,y,z target coords and start counter
offset. This is instead of it having too look these numbers up in caldb.

The reason it "crept in" is that the eloss package in not independent of
the clas software packages and was never meant to be. Conversely, the
rootbeer scheme is as independent as possible of the clas packages and
all other stuff (except, obviously, ROOT). The only thing rootbeer needs
to build and run is the clasbanks.ddl file which describes the BANKS for
the data being analysed. On this rare occasion that means a number has
to be gotten manually from the database and hard-wired in to your
analysis code.

(and Eugene, it didn't "creep in" to eloss, which I have never tampered
with. It "crept in" to the C/C++ wrapper for eloss - a rootbeer extra
which uses the standard checked out version of the eloss fortran code.)

Sorry if that has caused confusion.


Cheers
Ken


On Sat, 2010-10-16 at 08:51 -0400, Eugene Pasyuk wrote:
> I have no idea what this 'initEloss" is doing and how it crept in!
> It is not the original "InitEloss" that I wrote. This is different 
> function, note spelling difference. Maybe rootbeer experts should 
> explain us what is it. InitEloss form the original eloss package has 
> only one parameter: run_number.
> 
> -Eugene
> 
> 
> Michael Dugger wrote, On 10/16/10 00:36:
> >
> > Eugene,
> >
> > Thanks for the info.
> >
> > My COBRA stuff is getting the wrong info for eloss :(
> >
> > I'm so used to seeing the g8b numbers nothing looked wrong to me.
> >
> > In my rootbeer code I have
> > initELoss(0.0,0.0,0.0,2.0)
> >
> > Should this be
> > initELoss(0.0,0.0,0.0,-4.0) ?
> >
> > -Michael
> >
> > On Fri, 15 Oct 2010, Eugene Pasyuk wrote:
> >
> >> No, these numbers are incorrect. Those are g8b numbers.
> >> For g9a/b ST-offset should be -4 and target position at 0.
> >> This is what in caldb, run index: calib_user.RunIndexg9b.
> >>
> >> -Eugene
> >>
> >>
> >> Michael Dugger wrote, On 10/15/10 18:24:
> >>>
> >>> Eugene,
> >>>
> >>> My call to initeloss gives this:
> >>> InitEloss-I-: ST-offset is set to -24.059999
> >>> InitEloss-I-: Target position is set to 0.000000, 0.000000, -20.000000
> >>>
> >>> Is this correct?
> >>>
> >>> -Michael
> >>
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