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