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Re: Simple integral wrong

• To: mathgroup at smc.vnet.net
• Subject: [mg25072] Re: Simple integral wrong
• From: "Bill Bertram" <wkb at ansto.gov.au>
• Date: Thu, 7 Sep 2000 22:28:16 -0400 (EDT)
• Organization: Australian Nuclear Science and Technology Organisation
• References: <8opmr5$15@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Paul Cally <cally at kronos.maths.monash.edu.au> wrote in message
news:8opmr5$15 at smc.vnet.net...
> Try integrating | cos u| from u=0 to u = Pi x. Despite the integrand
> being everywhere
> non-negative, Mathematica 4 gives a result which jumps DOWNWARDS by 2 at
>
> x=1/2, 3/2, 5/2, ....


Are you sure of that? In my copy of Math V4 the following,

             Plot[Integrate[Abs[Cos[u]], {u, 0, x  Pi]}], {x, 0, 3}]

yields a graph of a monotonically increasing function!

Cheers,

     Bill