SetPrecision
SetPrecision[expr,p]
yields a version of expr in which all numbers have been set to have precision p.
Details

- When SetPrecision is used to increase the precision of a number, the number is padded with zeros. The zeros are taken to be in base 2. In base 10, the additional digits are usually not zeros.
- SetPrecision returns an arbitrary‐precision number, even if the precision requested is less than $MachinePrecision.
- SetPrecision[expr,MachinePrecision] converts numbers in expr to machine precision.
- If there are numbers too large or small to represent machine-precision numbers, SetPrecision[expr,MachinePrecision] will convert them to arbitrary-precision numbers with precision $MachinePrecision.
- If expr contains machine‐precision numbers, SetPrecision[expr,p] can give results that differ from one computer system to another.
- SetPrecision will first expose any hidden extra digits in the internal binary representation of a number, and, only after these are exhausted, add trailing zeros. »
- 0.004`25 generates a number with all trailing digits zero and precision 25 on any computer system.
- SetPrecision[expr,p] does not modify expr itself.
Examples
open allclose allBasic Examples (3)
Scope (5)
Applications (4)
Properties & Relations (5)
Possible Issues (1)
See Also
N Precision Chop SetAccuracy $MinPrecision $NumberMarks PrecisionGoal
Tutorials
Related Guides
Introduced in 1991
(2.0)
| Updated in 2003 (5.0)