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Re: double integral problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg112554] Re: double integral problem
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Sun, 19 Sep 2010 05:41:02 -0400 (EDT)

You have not defined the variable a so numeric techniques will not work.

Manipulate[
 NIntegrate[
  Exp[-a/(4 x) - 4 x],
  {Q, 0, 1}, {x, 0, Q}],
 {a, 0, 5, Appearance -> "Labeled"}]

Plot[NIntegrate[
  Exp[-a/(4 x) - 4 x],
  {Q, 0, 1}, {x, 0, Q}],
 {a, 0, 5}]


Bob Hanlon

---- Regina <regina.lagrasta 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



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