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Re: double integral problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg112547] Re: double integral problem
  • From: Simon <simonjtyler at gmail.com>
  • Date: Sun, 19 Sep 2010 05:39:45 -0400 (EDT)
  • References: <i727k7$eup$1@smc.vnet.net>

On Sep 18, 9:25 pm, Regina <regina.lagra... at googlemail.com> wrote:
> hi there,
> im trying to evaluate the following double integral:
> N[Integrate[Integrate[Exp[-a/(4 x) - 4 x], {x, 0, Q}], {Q, 0, 1}]]
>
> and set a to 1 or some other non-zero number.
>
> but for some reason, mathematica only gives me error messages. what am
> i doing wrong?
> best. regina

Hi Regina,

Do you want something like

In[1]:= With[{a=1}, NIntegrate[Exp[-(a/(4*x)) - 4*x], {Q, 0, 1},{x, 0,
Q}]]
Out[1]= 0.0391749

Simon


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