NIntegrate

*To*: mathgroup at smc.vnet.net*Subject*: [mg89176] NIntegrate*From*: Michael Weyrauch <michael.weyrauch at gmx.de>*Date*: Wed, 28 May 2008 04:45:19 -0400 (EDT)*Reply-to*: michael.weyrauch at gmx.de

Hello, I evaluate in Mathematica 5.2 Timing[Do[NIntegrate[Sin[x], {x, 0., 1.}], {k, 10000}]] {1.516 Second, Null} Doing this on the same computer in Mathematica 6.0.2 Timing[Do[NIntegrate[Sin[x], {x, 0., 1.}], {k, 10000}]] {84.5, Null} which does not look like progress. I realize that Mathematica 6.0.2 may use much more sophisticated techniques than 5.2, therefore, I directed it what I think Mathematica 5.2 may use (??): Timing[Do[NIntegrate[Sin[x], {x, 0., 1.}, Method -> {"GaussKronrodRule", "Points" -> 2, "SymbolicProcessing" -> 0}], {k, 10000}]] {21.391, Null} Still not very convincing in comparison to 5.2. What is going on here? And how can I direct Mathematica 6 to be as fast as 5.2 in trivial cases as the example above? Michael Weyrauch

**Follow-Ups**:**Re: NIntegrate***From:*"W_Craig Carter" <ccarter@mit.edu>