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MathGroup Archive 2007

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Re: plot question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg72702] Re: plot question
  • From: Peter Pein <petsie at dordos.net>
  • Date: Tue, 16 Jan 2007 02:23:15 -0500 (EST)
  • References: <eofj7u$hdb$1@smc.vnet.net>

dimitris schrieb:
> Hello!
> 
> Consider the following graph of the function -ln(|x|).
> 
> Plot[-Log[Abs[x]], {x, -2, 2}, PlotRange -> {Automatic, {-1, 3.5}},
> Axes -> False, Frame -> True, PlotPoints -> 100, FrameLabel -> {"x",
> "y"}]
> 
> How is it possible to make the y-axis point downwards (I need this
> because in half-space problems within the solid mechanics the possitive
> vertical axis is pointed into the half-space)?
> 
> Thanks in advance.
> Dimitris
> 

Hi Dimitris,

unfortunately I've just found this complicated FrameTicks option:
(Note, that -f[x] has to be plotted)

Block[{lbl},
  Plot[Log[Abs[x]], {x, -2, 2}, PlotRange -> {Automatic, {-3.5, 1}},
  Axes -> False, Frame -> True, PlotPoints -> 100, FrameLabel -> {"x", "y"},
  FrameTicks -> {Automatic,
    lbl = Flatten[{#1,
      If[IntegerQ[#1], {ToString[-#1], {3/400, 0}}, {"", {3/800, 0}}]}, 1]&
     /@ (Range[-15, 5] / 5), None, lbl /. _String -> ""}]]

But I'm sure, David Park will find an elegant solution :-)

Peter


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