Precision
Precision
Precision[ c ] returns the number of significant digits of a number with a precision.
Usages
Precision[ c ]
Precision[ c ] returns the number of significant digits of c, a number with a precision such as the result of Approximate or a PrecisionConstant.
| Example | in | out |
|---|---|---|
3.14 has 3 significant digits. |
Precision[ PrecisionConstant[3.14, 2] ] |
3 |
| Leading zeros do not count. | Precision[ PrecisionConstant[0.0314, 3] ] |
2 |
314.00 has 5 significant digits. |
Precision[ PrecisionConstant[314, 2] ] |
5 |
The result of Approximate. |
p := Approximate[Pi, 2] |
r = 3 |
Details
- Ordinary numbers have no precision:
Precision[ 3.14 ]is left unevaluated.
See also: PrecisionConstant, Approximate