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Does anyone know of a standard function in Ox that compares two arithmetic types and checks whether they are "equal", up to a given degree of numerical precision? e.g. (ma - mb)'(ma-mb) = -8.8435e-010 would produce ma == mb or iseq(ma, mb) = FALSE. Is there something that gets round this numerical problem? (I've got my own function doing that, but I wonder whether there is already one in the Ox function library) Thanks, Sophocles