Mathematica 9 is now available
Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2009

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Not all points plot on my graph...

  • To: mathgroup at smc.vnet.net
  • Subject: [mg105214] Re: [mg105158] Not all points plot on my graph...
  • From: DrMajorBob <btreat1 at austin.rr.com>
  • Date: Tue, 24 Nov 2009 05:51:10 -0500 (EST)
  • References: <200911231149.GAA21721@smc.vnet.net>
  • Reply-to: drmajorbob at yahoo.com

You get no plotted values for x<-2, because f is Complex there.

For instance,

f[-3] // N

-0.5 + 0.866025 I

Bobby

On Mon, 23 Nov 2009 05:49:43 -0600, davef <davidfrick2003 at yahoo.com> wrote:

> Why is it when I write this...
>
> Clear[f, x]
> f[x_] = (x + 2)^(2/3)
> Plot[f[x], {x, -3, 0}, PlotRange -> {{-3, 0}, {-4, 4}}]
> f[-3]
>
> .. I get no values show in the graph for x<-2 even though f[-3]
> evaluates to (-1)^(2/3).
>
> (-1)^(2/3) evaluates as f[-3]=1 so why wouldn't the point (-3,1) plot
> on my graph?
>
>


-- 
DrMajorBob at yahoo.com


  • Prev by Date: Re: Not all points plot on my graph...
  • Next by Date: Re: Not all points plot on my graph...
  • Previous by thread: Not all points plot on my graph...
  • Next by thread: Re: Not all points plot on my graph...