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Problem using Solve or Nsolve

  • To: mathgroup at smc.vnet.net
  • Subject: [mg124736] Problem using Solve or Nsolve
  • From: droopy <tototo at yopmail.com>
  • Date: Fri, 3 Feb 2012 02:10:12 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

Dear all,

I am a new user of mathematica and i am trying to find the upper limit of an integrate such as it is equal to a certain value.

Therefore, for the moment i did :
f = (4^x)*E^-4/Gamma[x + 1]; Reduce[{Integrate[f, {x, 0, A}] == 0.5}, {A}]

But it doesn't work, I did the same thing with Solve :
Solve[Integrate[f, {x, 0, A}] == 0.5, A]
but it doesn't work.

The only way that i found to obtain a solution was with FindRoot[Integrate[f, {x, 0, A}] == 0.5, {A, 2}]

Do you have a solution?

Thanks !



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