This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.

# SetAccuracy

 SetAccuracy[expr, a]yields a version of expr in which all numbers have been set to have accuracy a.
• When SetAccuracy is used to increase the accuracy 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.
• When expr contains machine-precision numbers, SetAccuracy[expr, a] can give results which differ from one computer system to another.
• SetAccuracy 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 accuracy 25 on any computer system.
Set the accuracy of all numbers in an expression to 20:
 Out[1]=

Convert from a machine number to an arbitrary-precision number with accuracy 32:
 Out[1]=
 Out[2]=
 Scope   (5)
 Applications   (1)
New in 2