       Re: Just primitive ColorFunction

• To: mathgroup at smc.vnet.net
• Subject: [mg87360] Re: Just primitive ColorFunction
• From: Peter Breitfeld <phbrf at t-online.de>
• Date: Tue, 8 Apr 2008 07:16:27 -0400 (EDT)
• References: <ftfej7\$bu7\$1@smc.vnet.net>

```©erých Jakub schrieb:
> I think, that it must be something very simple, but I cannot find the
> solution....
>
> I need to fill the Plot so, that area above the axis will be red and area
> below the axis will be blue. I tried it in a such way:
>
> Plot[Sin[x], {x, 0, 4 Pi} ,
>  AxesOrigin -> {0, 0},
>  Axes -> {True, True},
>  PlotStyle -> Thick,
>  ColorFunction ->
>   If[Sin[x] >= 0, RGBColor[1, 0, 0], RGBColor[0, 0, 1]],
>  Filling -> Axis,
>  ImageSize -> {380, 280}]
>
> But Mathematica says, that If is not a valid Color.
>
> If I try it with Function (according to examples in ColorFunction help),
>
> ColorFunction ->
>  Function[x, If[Sin[x] >= 0, RGBColor[1, 0, 0], RGBColor[0, 0, 1]]],
>
> it is working, but the color of Filling is red allover the range.
>
> Thanks for any hint, how to achieve the +Red/-Blue filling.
>
> Jakub
>
>

Jakub,

for this particular example the following works:

Plot[Sin[x], {x, 0, 4 Pi}, AxesOrigin -> {0, 0}, Axes -> {True, True},
PlotStyle -> Thick,
Filling -> Axis, FillingStyle -> {Blue, Red},
ImageSize -> {380, 280}]

Gruss Peter
--
==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==
Peter Breitfeld, Bad Saulgau, Germany -- http://www.pBreitfeld.de

```

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