Hi, > But i found if i make the size of 2D array a little > bit large, for example 20X20. Root crash quietly. > Float_t sen = mc[i][j]*mc[i][j]*1.0/bk[i][j]; When increasing the array (and thus decreasing the bin size) the probability increases that one of the bk[i][j]==0. Are you sure you never divide by zero? Cheers, Axel.
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