Re: Integral Convergence

*To*: mathgroup at smc.vnet.net*Subject*: [mg23738] Re: Integral Convergence*From*: dkeith at sarif.com*Date*: Mon, 5 Jun 2000 01:09:31 -0400 (EDT)*References*: <8gsnoh$ed1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Hi Viorel, NIntegrate[f[x],{x,x0,x1,x2,x3,...,xn}] gives NIntegrate[f[x],{x,x0,xn}] except it causes the algorithm to break the integral into pieces which you can choose to not straddle the discontinuity. (See further-examples under Help-NIntegrate.) David In article <8gsnoh$ed1 at smc.vnet.net>, Viorel Ontalus <vio2 at mail.lehigh.edu> wrote: > Dear All, > I am having problems with some calculations and I am asking for help or > suggestions. > > I am integrating a piecewise defined function. The function is non zero > for some periodic intervals. > When nonzero the function has the form f[x_]:=c * Sqrt[ 1-( (x-a)/b ) ^2* > UnitStep[1-( (x-a)/b )^2] ] > with a, b, c constants > g[y_]:=Integrate[f[x],{x,0,y}] > I want to plot g[y] > I get a lot of messages that are telling :"Nintegrate failed to > converge to prescribed accuracy" > " Integration converging too slowly" etc. > > Does anybody know a fix? > > Thanks Vio > > Sent via Deja.com http://www.deja.com/ Before you buy.