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user 96078
Questions on changing Mathematica expressions of one type or format to another, for example date formats, Boxes and other typesetting representations, or different units of measurements.
4
votes
How to get exact Rationalize of a decimal number?
I've found, empirically, that I can ensure Rationalize[ ] provides an exact rational conversion of whatever decimal I enter (call it "num") if I evaluate
Rationalize[num`z, 0] where:
$z \geq 2*\text{ … Alternately, you can also achieve an exact rational conversion using Round[num`y, 10^-y], where (again, empricially), I've found that:
$y \geq \text{Length@RealDigits[num][[1]]} + 1$
Thus:
Round[0.97646105481464028 …
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