I'm teaching numerical analysis next semester, so I'm investigating how we can use Sage's great support for specifying precision to explain some topics. I'd like to limit the exponents that a number in a RealField can have (for example, the exponent must be 0, 1, or -1. I see that mpfr supports changing the exponent ranges using mpfr_get_emin and mpfr_get_emax (see http://www.mpfr.org/mpfr-current/mpfr.html#Exception-Related-Functions). Is this exposed at all in Sage? It seems that the only thing I can set in a RealField is to change the number of bits in the mantissa.
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