Re: plot

*To*: mathgroup at smc.vnet.net*Subject*: [mg110710] Re: plot*From*: Bill Rowe <readnews at sbcglobal.net>*Date*: Sat, 3 Jul 2010 08:16:36 -0400 (EDT)

On 7/2/10 at 2:57 AM, auguaylupo at gmail.com (agua) wrote: >Hi With Plot[( (2x+1) Sqrt[x+1] ) / Sqrt[x-1] ,{x,-5,5}] hoped to >obtain a graph only for x>1. >What happened? regards. There is a singularity at x = 1 and your expression isn't real for -1 < x < 1. If you want to see more of the plot for x>1 add specify the plot range to be greater. And if you only want to see the plot for graph for x>1, set the range for x to start at 1. That is Plot[( (2x+1) Sqrt[x+1] ) / Sqrt[x-1] ,{x,0,5}, PlotRange->{0,100}] will only show the graph for x>1 and show more of that portion of the graph.