SetPrecision vs N

*To*: mathgroup at smc.vnet.net*Subject*: [mg71683] SetPrecision vs N*From*: "Andrew Moylan" <andrew.j.moylan at gmail.com>*Date*: Sun, 26 Nov 2006 03:49:19 -0500 (EST)

Hi all, Suppose I want to evaluate an expression at a given precision. What is the difference between using N[expr, precision] and using SetPrecision[expr, precision]? I've noticed that SetPrecision seems to be equivalent even in such situations as e.g. N[Integrate[...]] automatically calling NIntegrate[...] when the integral can't be done exactly: SetPrecision[Integrate[x^x, {x, 0, 1}], 20] and N[Integrate[x^x, {x, 0, 1}], 20] both give 0.78343051071213440706 Are there important differences between SetPrecision and N that I should be aware of? Cheers, Andrew

**Follow-Ups**:**Re: SetPrecision vs N***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>