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Re: exclusions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg86359] Re: exclusions
  • From: Helen Read <hpr at together.net>
  • Date: Sun, 9 Mar 2008 05:03:40 -0500 (EST)
  • References: <fqtqp5$db0$1@smc.vnet.net>
  • Reply-to: HPR <read at math.uvm.edu>

Jaccard Florian wrote:
> Hello!
> 
> Does somebody understand why this works fine :
> 
> Plot[Tan[x], {x, 0, Pi},
>    Exclusions -> Pi/2,
>    ExclusionsStyle -> Red]
> 
> (I obtain a red asymptote)
> 
> And this doesn't work like I logically expect?
> 
> Plot[x/Log[x], {x, 0, 10},
>    PlotRange -> {-5, 10},
>    Exclusions -> 1,
>    ExclusionsStyle -> Red]
> 
> (I obtain no asymptote at all)

I don't know why one works and the other does not (I have found 
Exclusions to be a little squirrelly sometimes), but the following does 
work.

Plot[x/Log[x], {x, 0, 10}, PlotRange -> {-5, 10},
  Exclusions -> {x == 1}, ExclusionsStyle -> Red]


-- 
Helen Read
University of Vermont


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