Re: Mathematica Weirdness
- To: mathgroup at smc.vnet.net
- Subject: [mg116705] Re: Mathematica Weirdness
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Thu, 24 Feb 2011 06:24:30 -0500 (EST)
You need to use more precision N[Integrate[1000000*Exp[x^2 - 12*x]*x^14, {x, 0, 1}], 20] 2.7482124237345664276 NIntegrate[1000000*Exp[x^2 - 12*x]*x^14, {x, 0, 1}] 2.74821 Bob Hanlon ---- Steve Heston <sheston at rhsmith.umd.edu> wrote: ============= My question is why I get a negative integral of a positive function? Integrate[1000000*Exp[x^2-12*x]*x^14,{x,0,1}]//N Integrate[1000000*Exp[x^2-12*x]*x^14,{x,0.,1}]//N NIntegrate[1000000*Exp[x^2-12*x]*x^14,{x,0,1}] The first line gives a negative answer, while the second two lines give identical positive answers. Something is strange here. Steve Steven L. Heston Associate Professor Finance Department Robert H. Smith School of Business 4447 Van Munching Hall Van Munching Hall University of Maryland College Park, MD 20742-1815 301-405-9686 TEL 301-405-0359 FAX sheston at rhsmith.umd.edu http://www.rhsmith.umd.edu