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Re: SmoothHistogram and Legends

  • To: mathgroup at smc.vnet.net
  • Subject: [mg126828] Re: SmoothHistogram and Legends
  • From: Bob Hanlon <hanlonr357 at gmail.com>
  • Date: Mon, 11 Jun 2012 00:01:05 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <699541.29032.1339226519200.JavaMail.root@m06>

You can readily determine the default color scheme.

p = Plot[Evaluate[
   Table[a*x, {a, 15}]],
  {x, 0, 1}]

The colors are

colors = Cases[p, Hue[__], Infinity]

{Hue[0.67, 0.6, 0.6], Hue[0.906068, 0.6, 0.6], Hue[0.142136, 0.6, 0.6],
 Hue[0.378204, 0.6, 0.6], Hue[0.614272, 0.6, 0.6], Hue[0.85034, 0.6, 0.6],
 Hue[0.0864079, 0.6, 0.6], Hue[0.322476, 0.6, 0.6], Hue[0.558544, 0.6, 0.6],
 Hue[0.794612, 0.6, 0.6], Hue[0.0306798, 0.6, 0.6], Hue[0.266748, 0.6, 0.6],
 Hue[0.502816, 0.6, 0.6], Hue[0.738884, 0.6, 0.6], Hue[0.974952, 0.6, 0.6]}

Note that the green and blue components are constant at 0.6 and only
the red component varies. Plotting the red component:

n = 1; ListPlot[
 c = Cases[colors,
   Hue[r_, 0.6, 0.6] :> {n++, r},
   Infinity]]

These are lines of constant slope

f[{lb_, ub_}] := FindFit[
  Select[c, lb <= #[[1]] <= ub &],
  a*x + b, {a, b}, x]

f /@ {{1, 2}, {3, 6}, {7, 10}, {11, 15}}

{{a -> 0.236068, b -> 0.433932}, {a -> 0.236068,
  b -> -0.566068}, {a -> 0.236068, b -> -1.56607}, {a -> 0.236068,
  b -> -2.56607}}

red[n_?NumericQ] := Module[
   {y = 0.236068 n + 0.433932},
   y - Floor[y]];

Plot[red[x], {x, 0, 15.2},
 Epilog -> {Red, AbsolutePointSize[3],
   Point[c]}]

The colors are then

color[n_Integer] := Hue[red[n], 0.6, 0.6]


Bob Hanlon


On Sun, Jun 10, 2012 at 2:16 AM, djmpark <djmpark at comcast.net> wrote:
> There is probably a way to do this in regular Mathematica that someone will
> show you. But since you indicate that you have searched and not found a
> working method I will make a custom graphic using the Presentations
> Application. I do the first example in SmoothHistogram/Scope/Data.
>
> << Presentations`
>
> ShowLegend[
>  Draw2D[
>  {MapThread[(SmoothHistogram[
>        RandomVariate[NormalDistribution[#1, 1/#1], 10^4],
>        PlotStyle -> #2,
>        Filling -> Axis,
>        FillingStyle -> Opacity[0.5, Blend[{#2, White}, 0.5]]] //
>       DrawGraphics) &,
>    {Range[4], {Blue, Magenta, Brown, Green}}]},
>  AspectRatio -> 1,
>  PlotRange -> {0, 1.6},
>  Axes -> True],
>
>  {{{Blue, "Curve 1"},
>   {Magenta, "Curve 2"},
>   {Brown, "Curve 3"},
>   {Green, "Curve 4"}},
>  LegendPosition -> {-1.1, 0.6},
>  LegendSize -> {0.7, 0.3},
>  LegendTextOffset -> {-0.6, 0},
>  LegendSpacing -> 0.6},
>  BaseStyle -> {FontSize -> 12, FontWeight -> "Bold"}]
>
> I used the ShowLegend statement, MapThread to construct each curve, and the
> DrawGraphics command to pick off the graphics primitives. It would be nice
> if WRI made available the canonical list of colors and fills they use with
> multiple curves.
>
>
> David Park
> djmpark at comcast.net
> http://home.comcast.net/~djmpark/index.html
>
>
>
> From: dangoogle at warp-7.com [mailto:dangoogle at warp-7.com]
>
>
> I am trying to put a legend on a SmoothHistogram that I generate
> (Mathematica 8), using an array of 6 data sets.  I can not find a single
> method for making a legend on a SmoothHistogram.  All of the methods that
> work with other charts and graphics don't seem to work with a
> SmoothHistogram.  Has anyone accomplished this?
>
>



--
Bob Hanlon



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