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Re: $Assumptions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg92656] Re: $Assumptions
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 9 Oct 2008 06:39:07 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <gci2ia$ta$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de

Hi,

and option in *not* an assumption. Assumptions are for symbols/variables
options are a way to do something.

Use SetOptions[]

Regards
   Jens

Ruth Lazkoz S=E1ez wrote:
> Dear all,
>
> I seem to be unable to change some default options globally.
>
> At the top of  my notebook I have
>
> $Assumptions = {MaxRecursion -> 30, AccuracyGoal -> 10};
>
> Then we I evaluate  NIntegrate[Exp[-x^2], {x, 20., 40.}]
> I get 4.78196*10^-176
>
> But if I  evaluate NIntegrate[Exp[-x^2], {x, 20., 40.}, MaxRecursion ->=
 30,
>  AccuracyGoal -> 10]
> I get quite a different value, 1.36703*10^-177
>
> I had the same problem trying to change the options for fonts in plots,=

> and then I had to add the options I wanted
> in every plot, I mean evaluation something like $TextStyle ={whatever=
}
> before doing the plots did not work.
>
> Hope you can help me. Thanks,
>
> Ruth Lazkoz
>


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