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BUILT-IN MATHEMATICA SYMBOL
Accuracy
Accuracy[x]
gives the effective number of digits to the right of the decimal point in the number x.
Details
- Accuracy[x] gives a measure of the absolute uncertainty in the value of x.
- With uncertainty dx, Accuracy[x] is -Log[10, dx].
- For exact numbers such as integers, Accuracy[x] is Infinity.
- Accuracy[x] does not normally yield an integer result, and need not be positive.
- For any approximate number x, Accuracy[x] is equal to Precision[x]-RealExponent[x].
- For machine-precision numbers, Accuracy[x] gives the same as $MachinePrecision-Log[10, Abs[x]]. »
- Accuracy[0.] is -Log[10, $MinMachineNumber]. »
- Numbers entered in the form
are taken to have accuracy a. - If x is not a number, Accuracy[x] gives the minimum value of Accuracy for all the numbers that appear in x. »
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