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Re: plot question

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  • Subject: [mg72719] Re: plot question
  • From: Bill Rowe <readnewsciv at>
  • Date: Tue, 16 Jan 2007 03:31:41 -0500 (EST)

On 1/15/07 at 5:35 AM, dimmechan at (dimitris) wrote:

>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",

>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)?

I am not sure I understand what you mean by "make the y-axis 
point downwards". I am guessing you want the increasingly 
positive tick values to appear toward the bottom of the page. If 
I have this right perhaps you will find the following satisfactory

Plot[-Log[Abs[x]], {x, -2, 2}, PlotRange -> {Automatic, {-1,
    3.5}}, Axes -> False, Frame -> True, PlotPoints -> 100, 
FrameLabel -> {"x",
    "y"}, FrameTicks -> {Automatic, Transpose[{
     Range[0, 3], Range[3, 0, -1]}], {}, {}}];
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