Re: plot question

• To: mathgroup at smc.vnet.net
• Subject: [mg72699] Re: plot question
• From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
• Date: Tue, 16 Jan 2007 02:11:10 -0500 (EST)
• Organization: The Open University, Milton Keynes, UK
• References: <eofj7u\$hdb\$1@smc.vnet.net>

```dimitris wrote:
> 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)?
>
> Dimitris
>

Hi Dimitris,

You will find detail explanations from Bob Hanlon and David Park on the
following threads "help - how to invert the x or y axis.." at

In your case, the following should work (note that I have also adjusted
the plot range accordingly):

In[1]:=
Plot[Log[Abs[x]], {x, -2, 2},
PlotRange -> {Automatic, {1, -3.5}},
Axes -> False,
Frame -> True,
PlotPoints -> 100,
FrameLabel -> {"x", "y"},
FrameTicks -> {Automatic, Table[{i, -i}, {i, -4, 1}], None,
None}];

Regards,
Jean-Marc

```

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