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Re: Find roots in a limited interval

  • To: mathgroup at smc.vnet.net
  • Subject: [mg86741] Re: [mg86732] Find roots in a limited interval
  • From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
  • Date: Thu, 20 Mar 2008 02:51:53 -0500 (EST)
  • References: <200803191028.FAA05346@smc.vnet.net>

You can't have any inequalities in Solve (and the syntax of your  
example is completely wrong). Reduce, on the other hand, should be  
able to handle the problem you have described, but as you do not give  
the slightest idea of what you did, there is no way of telling whether  
you "did not have any success with Reduce" also for the same reason  
(wrong syntax) or because your problem is one that Reduce can't handle.
There are also other ways of tackling such problems (if you are  
satisfied with finding only approximate roots) but again little can be  
said with the amount of information you have provided.

Andrzej Kozlowski


On 19 Mar 2008, at 11:28, viktor.albers at gmail.com wrote:
> Dear all,
>
> Being a Mathematica beginner I struggle to find a solution to a fairly
> simple problem. I have a function (superposition of several weighted
> sinc functions) which in principle has infinitely many roots.
>
> However I am interested only in lets say roots that are to be found
> within the limited interval between 0 and 5.
>
> I tried to define a system of inequalities of the type
>
> Solve[f[t] && t>0 && t<5, t] but no success.
> I played around with the function Reduce but did not have any success
> and I am also not sure if this is the right way forward.
>
> So the question: Is it possible to define an interval in Mathematica
> in which I am looking for the roots?
>
> Thank you for your time.
>
> Regards,
> Viktor
>
>



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