Re: Integrate...
- To: mathgroup at smc.vnet.net
- Subject: [mg44374] Re: [mg44257] Integrate...
- From: Dr Bob <drbob at bigfoot.com>
- Date: Fri, 7 Nov 2003 05:16:17 -0500 (EST)
- Organization: Interstellar Corps of Engineers
- Reply-to: drbob at bigfoot.com
- Sender: owner-wri-mathgroup at wolfram.com
That's an appalling bug, of course. Always sanity-check your outputs in
Mathematica!
However, NIntegrate gets it right without eliminating the floating point
1's.
NIntegrate[Abs[1.0*Cos[r]+1.0*Sin[r]],{r,2.35,2.36}]
0.0000373731
Bobby
Integrate...
Subject: [mg44374] [mg44257] Integrate...
From: Sampo Smolander <sampo.smolander+news at helsinki.fi>
To: mathgroup at smc.vnet.net
Organization: University of Helsinki
Does anybody know why
Integrate[Abs[1.0*Cos[r] + 1.0*Sin[r]], {r, 2.35, 2.36}]
gives
-2.82839
whereas without those 1.0's,
Integrate[Abs[Cos[r] + Sin[r]], {r, 2.35, 2.36}]
gives the correct
0.000037373
?
(I'm running Mathematica 4.1 on win98.)
--
Sampo Smolander ............... http://www.cs.helsinki.fi/u/ssmoland/
Rolf Nevanlinna Institute, University of Helsinki ...................