Hello Mr. Brun, a frame is the matrix (rows x columns) of adc-values (about 12 bit) which stems from one readout cycle of the CCD. In principle, an array of TH2S`s is sufficient to hold the data, but if people here want to look into time variations of e.g. of single column, a 3-dim dataarray seems more natural. They are used to an IDL-style like: signal = float( , , ) plot, signal( 3 , 5:10 , 98:150 ) Which would give them row 3 , col 5 to 10 , framenumber 98 to 150. If I would have a list of 2D-Hists, I would have to copy some entries of each into a new projection. I can write a class to hide that, but probably these things have all been done before. Would a list of TH2`s store (and need memory for) a lot of redundant information besides the data ? Florian Schopper > Hi Florian, Could you clarify what you mean by "Frame" >From your brief > explanation, I do not see why a TH2S histogram is not sufficient. The > histogram number being the framenumber, row, col obvious and the adc the > content (a short sufficient?) In case you intend to make statistical > calculations using zillions of frames, a TTree would seem to be the most > appropriate storage. > Rene Brun ---------------------------------------------------------------------- Florian Schopper office: MPI Halbleiterlabor Ludwig-Merk str. 3 Otto-Hahn-Ring 6 , Gebäude 72 D-80805 München D-81739 München Germany Germany phone: 49/89/32455680 phone mpe: 49/89/30000 3625 phone HLL: 49/89/839400-45 e-mail: fls@mpe.mpg.de http://www.gamma.mpe-garching.mpg.de/MEGA/mega.html ----------------------------------------------------------------------
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