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...er"] is a list, and it contains 1876 numeric numbers and NAs. I want to replace the NAs to zero, but don't know how to change it, the difficulty may be all the elements are of the class list, so it is hard to change. Thank you for your help! matrix spec: wavenumber prescan postscan H001 Numeric,1876 Numeric,1876 Numeric,1876 H002 Numeric,1876 Numeric,1876 Numeric,1876 H003 Numeric,1876 Numeric,1876 Numeric,1876 H004 Numeric,1876 Numeric,1876 Numeric,1876 H005 Numeric,1876 Numeric,1876 Numeric,1876 H006 Numeric,1876 Numeric,1876 Numeric,1876 [[alternative HTML version del...