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MathGroup Archive 2000

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Re: Simple integral wrong

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

Paul Cally <cally at> wrote in message
news:8opmr5$15 at
> 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!



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