MathGroup Archive 1997

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Q: Interval representations + rounding modes


Is there an (easy) way to give the interval representation of a (rational)
number, i.e. without typing N[rational_number, 50] or something like that,
i.e. [round-to-min-infinity(rational_number), round-to-plus-infinity(number)]?

There is a function Interval[], but it's not specified how the end-points
of the interval are defined... 

Do there exist functions 
	round-to-minus-infinity
        	-plus-infinity
	        -to-zero
	        -to-nearest


Stefan Becuwe


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