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Re: $Assumptions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg92630] Re: $Assumptions
  • From: Szabolcs Horvat <szhorvat at gmail.com>
  • Date: Thu, 9 Oct 2008 06:34:14 -0400 (EDT)
  • Organization: University of Bergen
  • References: <gci2ia$ta$1@smc.vnet.net>

Ruth Lazkoz Sáez 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};
> 

$Assumptions is for mathematica assumptions about symbols, not for 
options.  Please read the documentation page of $Assumptions.

> 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

Use

SetOptions[NIntegrate, MaxRecursion -> 30, AccuracyGoal -> 10]

etc.

> 
> 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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