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 >