yields a version of expr in which all numbers have been set to have precision p.
- 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. »
- generates a number with all trailing digits zero and precision 25 on any computer system.
- SetPrecision[expr,p] does not modify expr itself.
Introduced in 1991
(2.0)| Updated in 2003