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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.



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