From: Wilkinson, Jeff (jeff.wilkinson@medtronic.com)
Date: Thu Feb 14 2008 - 15:00:15 CET
I have been using flair to combine USRBDX files from a number of runs on multiple computers. This works fine when the total number of particles from all runs is less than ~2^31 (2.1E9). When I exceed that number the plotted spectrum suddenly becomes negative. The spectra remain negative until the total particles exceed ~2^32. The total number of primaries reported in the usrbdx_23_sum.lis is also a negative value at this time, although the total weight of primaries is correctly summed (see attached file). I believe that the plot is incorrect because it is being scaled with this negative value.
Is there a workaround for this or am I doing something wrong to trigger it? I have combined values from ASCII dumps of the USRBDX and the spectra are normal if they are scaled using the primaries weight, rather than the total number.
Regards,
Jeff Wilkinson
Medtronic Technical Fellow, Sr Principal R&D Engineer
Medtronic, Inc -- 8200 Coral Sea St NE -- Mounds View, MN 55112 USA
763-526-0483
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