       • To: mathgroup at smc.vnet.net
• Subject: [mg91991] Re: Advanced plotting
• From: "David Park" <djmpark at comcast.net>
• Date: Tue, 16 Sep 2008 19:23:39 -0400 (EDT)
• References: <gal3jl\$e1b\$1@smc.vnet.net>

```I have to admit that this was a bit of work because I never tried to make a
plot with an x-axis break before, but this can be done with the
Presentations package. I plot BesselJ[5,x] and x^2 on the same plot with the
y scale on the left going from -0.4 to 0.4 and on the right going from 0 to
2500. The scale on the right was produced with CustomTicks. The x^2 function
and scale are shown in Red. The functions are shown in the domain [0,10] and
[40,50] with a break, using a dashed line and "//" in the middle.

Since we can't have several partial scales on an axis with Mathematica, I
used two XTickLines from Presentations to produce the x scales from 0 to 10
and 40 to 50. This whole process might be automated if we were going to do a
lot of it. We have to do a  y scaling transformation on the x^2 function in
both its plotting and in the CustomTicks. We have to do x domain shifting
for both functions in the separated domain [40,50]. The x-axis and its
labeling are essentially hand crafter.

Needs["Presentations`Master`"]

yrightticks =
CustomTicks[-.4 + .00032 # &, {0, 5200, 500, 5},
CTNumberFunction -> (Style[#, Red] &)];
Draw2D[
{Draw[BesselJ[5, x], {x, 0, 10}],
Draw[BesselJ[5, x + 25], {x, 15, 25}],
Red,
Draw[-0.4` + 0.00032` x^2, {x, 0, 10}],
Draw[-0.4` + 0.00032` (x + 25)^2, {x, 15, 25}],
(* Draw the x axis in two pieces *)
Black,
{AbsoluteDashing[{4}], Line[{{10, -.4}, {25, -.4}}]},
Text[Style["//", 12, Bold], {12.5, -.4}],
XTickLine[{0, 10, -.4}, {0, 10}, {0, 10, 5}, 5,
XLabTickSpecs -> {0.02, 0}, XUnLabTickSpecs -> {.01, 0}],
XTickLine[{15, 25, -.4}, {40, 50}, {40, 50, 5}, 5,
XLabTickSpecs -> {0.02, 0}, XUnLabTickSpecs -> {.01, 0}],
AspectRatio -> .6,
Frame -> {False, True, False, True},
FrameTicks -> {None, Automatic, None, yrightticks},
FrameLabel -> {None, BesselJ[5, x], None, x^2},
RotateLabel -> False,
PlotRange -> {{0, 25}, {-.40, .40}},
PlotRangeClipping -> False,
ImagePadding -> {{60, 50}, {30, 10}},
PlotLabel -> "Two Scale Plot with x Axis Break",
BaseStyle -> {FontSize -> 12},
ImageSize -> 500]

--
David Park
djmpark at comcast.net
http://home.comcast.net/~djmpark/

<kazik.lakomy at gmail.com> wrote in message news:gal3jl\$e1b\$1 at smc.vnet.net...
> Hi,
> I am wondering is there a possibility in Mathematica 6 to use two
> different scales on vertical axis- one scale on the left one and the
> other on the right one (with a horizontal axis being common for both
> the vertical ones). The thing is I would like to plot two functions
> that have the same "x-domain" but completely different "y-domain". If
> I used the standard plotting procedure then if a first function (with
> values about 100) can be easily seen on the plot, the values of the
> other are to small (close to zero) to be seen. The solution would be
> to set two independent Y axes, however I don't know if there is the
> possibility in Mathematica 6 (I have seen such a plots in scientific
> papers but maybe done with some other application).
> The second question is is there a possibility to make breaks in axes.
> What I mean is that I have a plot with let say X domain [0,50], but I
> am only interested in two parts of it, say [0,10] and [40,50], so is
> it possible to set a kind of an option in Plot command? Such a "trick"
> is also quite common in scientific papers with characteristic "\\" on
> axis in a place where the "break" is made (I know for example how to
> do it in Origin and there is quite an easy task).
> I have been searching for the staff quite long and haven't found any
> solution yet so I would be really grateful if someone would help me
> with the issue.
> Best regards,
> Kazik
>

```

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